{"title":"SUBWOOFER 15\"","description":"\u003ch5 style=\"text-align: left;\"\u003e\u003cstrong\u003eCW SERIES\u003c\/strong\u003e\u003c\/h5\u003e\n\u003ch5 style=\"text-align: left;\"\u003e\u003cstrong\u003eC SERIES \/ CC SERIES\u003c\/strong\u003e\u003c\/h5\u003e\n\u003ch5 style=\"text-align: left;\"\u003e\u003cstrong\u003eCX SERIES \/ CXXX CARBON NEW SERIES\u003c\/strong\u003e\u003c\/h5\u003e\n\u003ch5 style=\"text-align: left;\"\u003e\n\u003cstrong\u003eX CARBON \/ XXX CARBON SERIES\u003c\/strong\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/h5\u003e","products":[{"product_id":"sp-15cx-3000-watt-rms","title":"SP 15CX Subwoofer 15\" 3000W RMS 2+2 Ohm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e3000 watt RMS.\u003cbr\u003e\u003cem\u003e76.2 mm voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm SPL subwoofer built around a 76.2 mm (3\") dual voice coil: 2+2 ohm, 3000 W RMS continuous, 6000 W peak, 89 dB sensitivity. Compressed paper and fibreglass cone, large \"R\" suspension, 220 °C aluminium winding, 86×3 oz Y30 ferrite magnet, 32 mm Xmax. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a18ca92e-6bc4-49c1-a881-3726696991ad.jpg?v=1790011321\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a18ca92e-6bc4-49c1-a881-3726696991ad.jpg?v=1790011321\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a18ca92e-6bc4-49c1-a881-3726696991ad.jpg?v=1790011321\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a18ca92e-6bc4-49c1-a881-3726696991ad.jpg?v=1790011321\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 900px, 100vw\" width=\"1536\" height=\"2752\" alt='SP 15CX subwoofer 15\"\/38 cm, 3000 W RMS, 2+2 ohm dual voice coil' loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e3000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e6000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX \/ PEAK\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e89\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 76.2 MM VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e XMAX 32 MM\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e3000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e6000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 3000 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e3000 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 3000 W RMS is the power the voice coil handles continuously, with 6000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 76.2 mm (3\") voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 220 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eTwo 2 ohm coils: in series 4 ohm, in parallel 1 ohm. You choose the impedance that matches your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e32 mm Xmax on a 15\" cone\u003c\/b\u003e\n\u003cp\u003e804.2 cm² of radiating surface (Sd) and 32 mm of linear excursion: compressed paper with fibreglass, large \"R\" suspension, 86×3 oz Y30 ferrite motor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eLook at it closely\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pnl\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_d51dea46-fd39-4d0e-aac8-e7a8d264e6e6.png?v=1790011321\u0026amp;width=620\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_d51dea46-fd39-4d0e-aac8-e7a8d264e6e6.png?v=1790011321\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_d51dea46-fd39-4d0e-aac8-e7a8d264e6e6.png?v=1790011321\u0026amp;width=620 620w\" sizes=\"(min-width:1000px) 500px, 100vw\" width=\"1472\" height=\"704\" alt=\"SP 15CX subwoofers on the shelf of a car audio shop\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003e01\u003c\/b\u003e · The cone: compressed paper + fibreglass, black painting, large \"R\" suspension\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_94b97c54-2437-41c4-a9c1-a4e4bb28409e.png?v=1790011322\u0026amp;width=620\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_94b97c54-2437-41c4-a9c1-a4e4bb28409e.png?v=1790011322\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_94b97c54-2437-41c4-a9c1-a4e4bb28409e.png?v=1790011322\u0026amp;width=620 620w\" sizes=\"(min-width:1000px) 500px, 100vw\" width=\"1472\" height=\"704\" alt=\"Two SP 15CX subwoofers in a glass display case\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003e02\u003c\/b\u003e · The motor: 86×3 oz Y30 ferrite magnet, 76.2 mm voice coil, Bl 20.14\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15CX\u003c\/div\u003e\n\u003cp\u003eWiring of the two voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15CX-Manual-EN-2026.pdf?v=1790621523\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eOne SP 15CX subwoofer\u003c\/b\u003e\n\u003cp\u003eThe price is for a single unit, not for a pair. Chassis, cone and motor assembled and tested.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eThe PDF manual\u003c\/b\u003e\n\u003cp\u003eWiring of the two voice coils, impedance options and the full data sheet, downloadable from the button above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eInvoice and warranty\u003c\/b\u003e\n\u003cp\u003eInvoice from an Italian company, warranty on manufacturing defects, and free technical support from Italy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pnl\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_39c82a04-f3bc-4c86-88e6-bd6b18bd8f1a.png?v=1790011321\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_39c82a04-f3bc-4c86-88e6-bd6b18bd8f1a.png?v=1790011321\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_39c82a04-f3bc-4c86-88e6-bd6b18bd8f1a.png?v=1790011321\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 460px, 100vw\" width=\"1472\" height=\"704\" alt=\"SP 15CX subwoofer pair in a car audio store\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003eThree-quarter view\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_269c7f5e-cdbc-4059-9c0f-225594c27ca1.png?v=1790011321\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_269c7f5e-cdbc-4059-9c0f-225594c27ca1.png?v=1790011321\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_269c7f5e-cdbc-4059-9c0f-225594c27ca1.png?v=1790011321\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 460px, 100vw\" width=\"1248\" height=\"832\" alt=\"SP 15CX subwoofers, orange basket and terminals\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003eBasket and terminals\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER AND LOAD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower handling — continuous (RMS)\u003c\/td\u003e\n\u003ctd\u003e3000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower handling — peak (MAX)\u003c\/td\u003e\n\u003ctd\u003e6000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm (the two coils in series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coils\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm, dual voice coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eACOUSTICS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e89 dB SPL 1 W \/ 1 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e25–300 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR AND MATERIALS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e76.2 mm \/ 3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e220 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e86×3 oz Y30 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge \"R\" form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass + black painting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eRECOMMENDED VENTED ENCLOSURE\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e125 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency\u003c\/td\u003e\n\u003ctd\u003e30 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent diameter\u003c\/td\u003e\n\u003ctd\u003eø 102 mm, circular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent length\u003c\/td\u003e\n\u003ctd\u003e14.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent cross area\u003c\/td\u003e\n\u003ctd\u003e81.7 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd correction\u003c\/td\u003e\n\u003ctd\u003eTwo flanged ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e35.00 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.551\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e6.193\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.605\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e69.61 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e32 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e20.14 T·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e804.2 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e285.676 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e75.93 mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPL\u003c\/td\u003e\n\u003ctd\u003e89.0 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eMONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI — 1500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-0ga-red-100-ofc-30m-spool\"\u003e\u003csmall\u003ePOWER CABLE\u003c\/small\u003e\u003cstrong\u003eSP 0GA RED 100% OFC — 30 m spool\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/kit-cable-0-awg\"\u003e\u003csmall\u003eCOMPLETE WIRING KIT\u003c\/small\u003e\u003cstrong\u003eSP KIT CABLE 0 AWG\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION\u003c\/small\u003e\u003cstrong\u003eSP DB 01 — 1x0GA in + 3x4GA out\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e The two 2 ohm coils in series give 4 ohm, in parallel 1 ohm. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 3000 W RMS.\u003c\/b\u003e Sizing on the 6000 W peak figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e The data sheet gives a 125 L vented box tuned to 30 Hz: thick panels, braced and sealed, or the box will lose output and rattle. With 32 mm of Xmax, leave the cone room to move.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e, with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15CX handle?\u003c\/b\u003e3000 W RMS continuous and 6000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eDual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 3000 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 76.2 mm (3\"), Xmax 32 mm.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow many litres does the box need?\u003c\/b\u003eThe data sheet gives a vented enclosure of 125 L tuned to 30 Hz, with a ø 102 mm vent 14.5 cm long.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15CX handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"3000 W RMS continuous and 6000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Dual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 3000 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 76.2 mm (3\\\"), Xmax 32 mm.\"}}, {\"@type\": \"Question\", \"name\": \"How many litres does the box need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The data sheet gives a vented enclosure of 125 L tuned to 30 Hz, with a 102 mm vent 14.5 cm long.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42851759456468,"sku":"16000","price":639.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_056086b4-5e20-4ccc-bc5f-577c252ac527.webp?v=1772086723"},{"product_id":"sp-15cw-500-watt-rms","title":"SP 15CW Entry Level Subwoofer 15\" 500W RMS","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e500 watt RMS.\u003cbr\u003e\u003cem\u003e61.1 mm voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\" \/ 38 cm subwoofer built around a 61.1 mm (2.5\") dual voice coil: 4 ohm rated, 2+2 ohm coils, 500 W RMS continuous, 1000 W peak, 86 dB sensitivity. Black non-pressed paper cone, large “R” suspension, 200 °C aluminium winding. Sold per unit. Manufacturer's recommended vented box: 105 L tuned to 30.1 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/9_721845d8-0e08-41a2-9726-5fa7a53ecb07.webp?v=1772086857\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/9_721845d8-0e08-41a2-9726-5fa7a53ecb07.webp?v=1772086857\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/9_721845d8-0e08-41a2-9726-5fa7a53ecb07.webp?v=1772086857\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/9_721845d8-0e08-41a2-9726-5fa7a53ecb07.webp?v=1772086857\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 900px, 100vw\" alt='SP 15CW subwoofer 15\" \/ 38 cm, 500 W RMS, 2+2 ohm dual voice coil' loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e500\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e1000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX \/ PEAK\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e86\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 61.1 MM VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e EASY WIRING\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e500 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e1000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 500 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e500 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 500 W RMS is the power the voice coil handles continuously, with 1000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 61.1 mm (2.5\") voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 200 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eTwo coils: in parallel 1 ohm, in series 4 ohm. You choose the impedance that matches your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e62 oz ferrite motor\u003c\/b\u003e\n\u003cp\u003eA 62 oz Y30 ferrite magnet under a black non-pressed paper cone and a large “R” suspension: 10 mm Xmax of usable excursion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15CW\u003c\/div\u003e\n\u003cp\u003eVoice coil wiring, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15CW-Manual-EN-2026.pdf?v=1790621523\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eIN THE BOX\u003c\/b\u003e\n\u003cp\u003eOne SP 15CW subwoofer, sold as a single unit, in its SP Audio box.\u003c\/p\u003e\n\u003cp class=\"sm\"\u003e\u003cb\u003eNot included:\u003c\/b\u003e enclosure, amplifier, cables and fixings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum impedance\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm, dual voice coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e500 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e1000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e86 dB SPL 1W\/1M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e30–1000 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e61.1 mm \/ 2.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e200 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e62 oz Y30 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge “R” form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eBlack non-pressed paper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\" style=\"margin-top: 14px;\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e30.1 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.936\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e7.24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e1.075\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e96.12 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e283.9 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e0.099 mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e829.58 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e2.32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPL\u003c\/td\u003e\n\u003ctd\u003e85.77 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\" style=\"margin-top: 14px;\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eRECOMMENDED VENTED BOX\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e105 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency\u003c\/td\u003e\n\u003ctd\u003e30.1 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent shape\u003c\/td\u003e\n\u003ctd\u003eCircle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd correction\u003c\/td\u003e\n\u003ctd\u003eOne flanged end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eMONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI — 1500 W RMS\u003c\/strong\u003e\u003c\/a\u003e \u003ca href=\"\/en\/products\/kit-cable-4-awg\"\u003e\u003csmall\u003eCOMPLETE WIRING KIT\u003c\/small\u003e\u003cstrong\u003eSP KIT CABLE 4 AWG\u003c\/strong\u003e\u003c\/a\u003e \u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION BLOCK\u003c\/small\u003e\u003cstrong\u003eSP DB 01 — 1×0GA IN + 3×4GA OUT\u003c\/strong\u003e\u003c\/a\u003e \u003ca href=\"\/en\/products\/sp-15c-500-watt-rms\"\u003e\u003csmall\u003eANOTHER SUBWOOFER\u003c\/small\u003e\u003cstrong\u003eSP 15C — 500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e The two 2 ohm coils in parallel give 1 ohm; in series they give 4 ohm. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 500 W RMS.\u003c\/b\u003e Sizing on the 1000 W peak figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e The manufacturer gives a vented box of 105 L tuned to 30.1 Hz: thick panels, braced and sealed, or the box will lose output and rattle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15CW handle?\u003c\/b\u003e500 W RMS continuous and 1000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003e4 ohm rated, dual voice coil 2+2 ohm. Wired in series the two coils give 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 500 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat box does it need?\u003c\/b\u003eA vented box of 105 L tuned to 30.1 Hz, with a circular port.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 61.1 mm (2.5\").\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15CW handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"500 W RMS continuous and 1000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"4 ohm rated, dual voice coil 2+2 ohm. Wired in series the two coils give 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 500 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"What box does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A vented box of 105 L tuned to 30.1 Hz, with a circular port.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 61.1 mm (2.5\\\").\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42855936753876,"sku":"1615","price":189.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_622d893f-649e-4faa-868b-443eb8f669ca.webp?v=1772086843"},{"product_id":"sp-15c-500-watt-rms","title":"SP 15C Subwoofer 15\" 500W RMS 2+2 Ohm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e500 watt RMS.\u003cbr\u003e\u003cem\u003e65.5 mm voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\" \/ 38 cm subwoofer built around a 65.5 mm (2.5\") dual voice coil: 4 ohm rated, 2+2 ohm coils, 500 W RMS continuous, 1000 W peak, 89 dB sensitivity. Compressed paper and fibreglass cone, large “R” suspension, 180 °C aluminium winding. Sold per unit. Manufacturer's recommended vented box: 100 L tuned to 30 Hz.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6ee996c7-5cf1-4524-92bb-17396b56c4ae.jpg?v=1790015239\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6ee996c7-5cf1-4524-92bb-17396b56c4ae.jpg?v=1790015239\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6ee996c7-5cf1-4524-92bb-17396b56c4ae.jpg?v=1790015239\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6ee996c7-5cf1-4524-92bb-17396b56c4ae.jpg?v=1790015239\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 900px, 100vw\" alt='SP 15C subwoofer 15\" \/ 38 cm, 500 W RMS, held inside a car interior' width=\"760\" height=\"507\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e500\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e1000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX \/ PEAK\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e89\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 65.5 MM VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e EASY WIRING\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e500 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e1000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 500 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e500 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 500 W RMS is the power the voice coil handles continuously, with 1000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 65.5 mm (2.5\") voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 180 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eTwo coils: in parallel 1 ohm, in series 4 ohm. You choose the impedance that matches your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e85 oz ferrite motor\u003c\/b\u003e\n\u003cp\u003eA 85 oz Y30 ferrite magnet under a compressed paper and fibreglass cone with a large “R” suspension: 12 mm Xmax of usable excursion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eLook at it closely\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pnl\"\u003e\n\u003cfigure style=\"margin: 0 0 14px; background: #161616; border: 1px solid #262626;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_dc1a3d77-a880-405d-8b5e-a52839512163.jpg?v=1790015239\u0026amp;width=620\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_dc1a3d77-a880-405d-8b5e-a52839512163.jpg?v=1790015239\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_dc1a3d77-a880-405d-8b5e-a52839512163.jpg?v=1790015239\u0026amp;width=620 620w\" sizes=\"(min-width:1000px) 480px, 100vw\" alt=\"SP 15C — cone and large R suspension, front view, in a car\" width=\"620\" height=\"797\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption style=\"font-size: 11px; letter-spacing: 1.4px; color: #9d9d9d; padding: 10px 12px; text-transform: uppercase;\"\u003e\u003cb\u003eCone and suspension\u003c\/b\u003e · front view\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cfigure style=\"margin: 0 0 14px; background: #161616; border: 1px solid #262626;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6bf87994-d43f-427f-aa9c-0df81ccc4e07.jpg?v=1790015239\u0026amp;width=620\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6bf87994-d43f-427f-aa9c-0df81ccc4e07.jpg?v=1790015239\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_6bf87994-d43f-427f-aa9c-0df81ccc4e07.jpg?v=1790015239\u0026amp;width=620 620w\" sizes=\"(min-width:1000px) 480px, 100vw\" alt=\"SP 15C — orange cast basket and 65.5 mm voice coil terminals, side view\" width=\"620\" height=\"797\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption style=\"font-size: 11px; letter-spacing: 1.4px; color: #9d9d9d; padding: 10px 12px; text-transform: uppercase;\"\u003e\u003cb\u003eMagnet assembly\u003c\/b\u003e · rear view\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15C\u003c\/div\u003e\n\u003cp\u003eVoice coil wiring, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15C-Manual-EN-2026.pdf?v=1790621523\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv class=\"ph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_635e8a5a-51e7-4949-aca7-eb5af24fffbf.jpg?v=1790015239\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_635e8a5a-51e7-4949-aca7-eb5af24fffbf.jpg?v=1790015239\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_635e8a5a-51e7-4949-aca7-eb5af24fffbf.jpg?v=1790015239\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 460px, 100vw\" alt='SP 15C 15\" \/ 38 cm subwoofer as delivered, single unit, seen from the rear' width=\"560\" height=\"374\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIN THE BOX\u003c\/b\u003e\n\u003cp\u003eOne SP 15C subwoofer, sold as a single unit, in its SP Audio box.\u003c\/p\u003e\n\u003cp class=\"sm\"\u003e\u003cb\u003eNot included:\u003c\/b\u003e enclosure, amplifier, cables and fixings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum impedance\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm, dual voice coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e500 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e1000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e89 dB SPL 1W\/1M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e25–300 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e65.5 mm \/ 2.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e180 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e85 oz Y30 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge “R” form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass + black painting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\" style=\"margin-top: 14px;\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e28.54 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.498\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e5.025\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.553\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e117.79 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e242.198 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e128.37 µm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e804.2 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDd\u003c\/td\u003e\n\u003ctd\u003e32.00 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e17.73 T·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPL\u003c\/td\u003e\n\u003ctd\u003e89 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\" style=\"margin-top: 14px;\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eRECOMMENDED VENTED BOX\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e100 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency\u003c\/td\u003e\n\u003ctd\u003e30 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent shape\u003c\/td\u003e\n\u003ctd\u003eCircle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent diameter\u003c\/td\u003e\n\u003ctd\u003eø102 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent length\u003c\/td\u003e\n\u003ctd\u003e17.23 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-sectional area\u003c\/td\u003e\n\u003ctd\u003e81.7 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd correction\u003c\/td\u003e\n\u003ctd\u003eTwo flanged ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eMONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI — 1500 W RMS\u003c\/strong\u003e\u003c\/a\u003e \u003ca href=\"\/en\/products\/kit-cable-4-awg\"\u003e\u003csmall\u003eCOMPLETE WIRING KIT\u003c\/small\u003e\u003cstrong\u003eSP KIT CABLE 4 AWG\u003c\/strong\u003e\u003c\/a\u003e \u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION BLOCK\u003c\/small\u003e\u003cstrong\u003eSP DB 01 — 1×0GA IN + 3×4GA OUT\u003c\/strong\u003e\u003c\/a\u003e \u003ca href=\"\/en\/products\/sp-15cw-500-watt-rms\"\u003e\u003csmall\u003eANOTHER SUBWOOFER\u003c\/small\u003e\u003cstrong\u003eSP 15CW — 500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e The two 2 ohm coils in parallel give 1 ohm; in series they give 4 ohm. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 500 W RMS.\u003c\/b\u003e Sizing on the 1000 W peak figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e The manufacturer gives a vented box of 100 L tuned to 30 Hz: thick panels, braced and sealed, or the box will lose output and rattle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15C handle?\u003c\/b\u003e500 W RMS continuous and 1000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003e4 ohm rated, dual voice coil 2+2 ohm. Wired in series the two coils give 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 500 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat box does it need?\u003c\/b\u003eA vented box of 100 L tuned to 30 Hz, with a circular port of ø102 mm and 17.23 cm long.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 65.5 mm (2.5\").\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15C handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"500 W RMS continuous and 1000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"4 ohm rated, dual voice coil 2+2 ohm. Wired in series the two coils give 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 500 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"What box does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A vented box of 100 L tuned to 30 Hz, with a circular port of ø102 mm and 17.23 cm long.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 65.5 mm (2.5\\\").\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42855943798996,"sku":"16311","price":279.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_fc980479-48b1-41d0-9878-85c523816e4f.webp?v=1772086774"},{"product_id":"sp-15cc-1000-watt-rms","title":"SP 15CC Subwoofer 15\" 1000W RMS 2+2 Ohm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\"\/38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e1000 watt RMS.\u003cbr\u003e\u003cem\u003e76.2 mm \/ 3\" voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm subwoofer built around a 76.2 mm \/ 3\" dual voice coil: 2+2 ohm, 1000 W RMS continuous, 2000 W peak, 89 dB sensitivity. Cone in compressed paper, fibreglass and black paint, large \"R\" suspension, 180 °C aluminium wire winding. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e1000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e2000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX \/ PEAK\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e89\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e VOICE COIL 76.2 MM \/ 3\"\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e EASY WIRING\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e1000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX \/ PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e2000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 1000 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e1000 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 1000 W RMS is the power the voice coil handles continuously, with 2000 W of peak on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 76.2 mm \/ 3\" voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 180 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eTwo 2 ohm coils: in parallel 1 ohm, in series 4 ohm. You choose the impedance that matches your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA cone built to be driven hard\u003c\/b\u003e\n\u003cp\u003eCone in compressed paper, fibreglass and black paint, with large \"R\" suspension and 5.0 mm of Xmax: it takes the excursion without losing shape.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15CC\u003c\/div\u003e\n\u003cp\u003eWiring of the voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15CC-Manual-EN-2026.pdf?v=1790621523\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e1 × SP 15CC subwoofer.\u003c\/b\u003e The price shown is for a single unit, not for a pair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe user manual in PDF.\u003c\/b\u003e Wiring of the voice coils, impedance and full specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAn invoice from an Italian company\u003c\/b\u003e, with EU warranty on manufacturing defects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFree technical support from Italy\u003c\/b\u003e, before and after you install it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm, dual voice coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e1000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e2000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e89 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e20–200 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e76.2 mm \/ 3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e180 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e134 Oz Y30 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge \"R\" form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass + black painting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e5.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e37.00 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.633\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.663\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e13.763\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e69.93 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e76.13 µm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e247.781 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e18.55 TM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e804.2 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended vented enclosure\u003c\/td\u003e\n\u003ctd\u003e80 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure tuning frequency\u003c\/td\u003e\n\u003ctd\u003e35 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eMONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI — 1500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/kit-cable-0-awg\"\u003e\u003csmall\u003eCOMPLETE WIRING KIT\u003c\/small\u003e\u003cstrong\u003eSP KIT CABLE 0 AWG\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-0ga-red-100-ofc-30m-spool\"\u003e\u003csmall\u003ePOWER CABLE\u003c\/small\u003e\u003cstrong\u003eSP 0GA RED 100% OFC — 30 m spool\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION BLOCK\u003c\/small\u003e\u003cstrong\u003eSP DB 01 — 1×0 GA in, 3×4 GA out\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e The two 2 ohm coils in parallel give 1 ohm; in series they give 4 ohm. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 1000 W RMS.\u003c\/b\u003e Sizing on the 2000 W figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e A 15\" cone moving this much air loads the box: thick panels, braced and sealed, or the box will lose output and rattle. The manufacturer sheet gives 80 L vented, tuned to 35 Hz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e, with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15CC handle?\u003c\/b\u003e1000 W RMS continuous and 2000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eDual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 1000 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 76.2 mm \/ 3\".\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat is the frequency range?\u003c\/b\u003e20–200 Hz, with 89 dB sensitivity.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15CC handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"1000 W RMS continuous and 2000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Dual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 1000 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 76.2 mm \/ 3\\\".\"}}, {\"@type\": \"Question\", \"name\": \"What is the frequency range?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"20–200 Hz, with 89 dB sensitivity.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42855947698388,"sku":"16300","price":349.01,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_969c5f99-6b88-40c7-8e2c-5df525768c3b.webp?v=1772086748"},{"product_id":"sp-15cxxx-3500-watt-rms","title":"SP 15CXXX Subwoofer 15\" 3500W RMS 2+2 Ohm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .cw figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:9px 12px 12px}.sp4 .cw figcaption b{color:#E8560F}.sp4 .cw figure{margin:0}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e3500 watt RMS.\u003cbr\u003e\u003cem\u003e75.5 mm voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm subwoofer built around a 75.5 mm dual voice coil: 2+2 ohm, 3500 W RMS continuous, 7000 W peak, 89 dB sensitivity. compressed paper + fibreglass + black paint cone, large “R” form suspension, 220 °C aluminium wire winding. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_ef7832a1-bc82-4a7a-a934-9a7a1121de73.jpg?v=1790014508\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_ef7832a1-bc82-4a7a-a934-9a7a1121de73.jpg?v=1790014508\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_ef7832a1-bc82-4a7a-a934-9a7a1121de73.jpg?v=1790014508\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_ef7832a1-bc82-4a7a-a934-9a7a1121de73.jpg?v=1790014508\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt='SP 15CXXX subwoofer 15\"\/38 cm on display in a lit car audio shop window' width=\"1632\" height=\"2624\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e3500\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e7000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e89\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 75.5 MM VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e EASY WIRING\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e3500 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e7000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 3500 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e3500 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 3500 W RMS is the power the voice coil handles continuously, with 7000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 75.5 mm voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 220 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eTwo coils: in parallel 1 ohm, in series 4 ohm. You choose the impedance that matches your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eCone built to be driven hard\u003c\/b\u003e\n\u003cp\u003eCompressed paper + fibreglass + black paint, large “R” form suspension: it takes the excursion without losing shape.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eLook closer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_68a318f8-f1b5-49f0-9f44-5f06ef7c400a.jpg?v=1790014508\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_68a318f8-f1b5-49f0-9f44-5f06ef7c400a.jpg?v=1790014508\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_68a318f8-f1b5-49f0-9f44-5f06ef7c400a.jpg?v=1790014508\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP 15CXXX subwoofer on a showroom plinth, basket and motor assembly in view\" width=\"2048\" height=\"2048\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eRear and motor assembly\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_b7876a5b-b5ea-4bca-8a40-f74f942b8613.jpg?v=1790014508\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_b7876a5b-b5ea-4bca-8a40-f74f942b8613.jpg?v=1790014508\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_b7876a5b-b5ea-4bca-8a40-f74f942b8613.jpg?v=1790014508\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"Front view of the SP 15CXXX cone and large R form suspension on a wooden surface\" width=\"2048\" height=\"2048\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eCone and suspension, front view\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15CXXX\u003c\/div\u003e\n\u003cp\u003eWiring of the two voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15CXXX-Manual-EN-2026.pdf?v=1790621523\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003eOne \u003cb\u003eSP 15CXXX\u003c\/b\u003e subwoofer — the price is for a single unit.\u003c\/li\u003e\n\u003cli\u003eThe full user manual in PDF, linked above, with the wiring diagram of the two voice coils.\u003c\/li\u003e\n\u003cli\u003eInvoice from an Italian company, shipping from our warehouse in Italy.\u003c\/li\u003e\n\u003cli\u003eFree technical support from Italy before and after the installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER AND LOAD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm (dual voice coil 2+2 ohm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e3500 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e7000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eACOUSTICS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity (1 W \/ 1 m)\u003c\/td\u003e\n\u003ctd\u003e89 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e20–750 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR AND MATERIALS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e75.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e220 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge “R” form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass + black paint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eMONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI — 1500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-0awg-100-ofc-58mm2-red\"\u003e\u003csmall\u003ePOWER CABLE\u003c\/small\u003e\u003cstrong\u003eSP 0GA RED 100% OFC\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/kit-cable-0-awg\"\u003e\u003csmall\u003eCOMPLETE WIRING KIT\u003c\/small\u003e\u003cstrong\u003eSP KIT CABLE 0 AWG\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION BLOCK\u003c\/small\u003e\u003cstrong\u003eSP DB 01 — 1x0GA IN + 3x4GA OUT\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e The two 2 ohm coils in parallel give 1 ohm, in series 4 ohm. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 3500 W RMS.\u003c\/b\u003e Sizing on the 7000 W PEAK figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e A 15\" cone moving this much air loads the box: thick panels, braced and sealed, or the box will lose output and rattle. The product sheet does not give a recommended box volume: write to us and we will work it out with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e, with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15CXXX handle?\u003c\/b\u003e3500 W RMS continuous and 7000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eDual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 3500 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 75.5 mm.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat is the frequency range?\u003c\/b\u003e20–750 Hz, with 89 dB sensitivity.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15CXXX handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"3500 W RMS continuous and 7000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Dual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 3500 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 75.5 mm.\"}}, {\"@type\": \"Question\", \"name\": \"What is the frequency range?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"20–750 Hz, with 89 dB sensitivity.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42855951270100,"sku":"16003","price":669.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/A.webp?v=1778905457"},{"product_id":"sp-15xxx-10-000-watt-rms","title":"SP 15XXX Carbon Subwoofer 15\" 10000W RMS","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .cw figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:9px 12px 12px}.sp4 .cw figcaption b{color:#E8560F}.sp4 .cw figure{margin:0}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e10000 watt RMS.\u003cbr\u003e\u003cem\u003e4 inch voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm subwoofer built around a 4 inch voice coil: rated 4 ohm with 2+2 ohm coils, 10000 W RMS continuous, 20000 W peak, 86.2 dB SPL sensitivity, 18–250 Hz. Compressed paper + fibreglass cone, large “R” form suspension, 280 °C aluminium wire winding, 203.6×5 Oz Y35 ferrite magnet, 60 kg per unit. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_895a4616-8cc8-453c-b8ee-039cdbedf33a.jpg?v=1790012930\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_895a4616-8cc8-453c-b8ee-039cdbedf33a.jpg?v=1790012930\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_895a4616-8cc8-453c-b8ee-039cdbedf33a.jpg?v=1790012930\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_895a4616-8cc8-453c-b8ee-039cdbedf33a.jpg?v=1790012930\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt='SP 15XXX Carbon Fibers subwoofer 15\"\/38 cm on display in a lit glass showcase of a car audio shop' width=\"2048\" height=\"2048\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e10000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e20000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e86.2\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 4 INCH VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e XMAX 25 MM\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e10000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e20000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 10000 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e10000 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 10000 W RMS is the power the voice coil handles continuously, with 20000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 4 inch voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 280 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eRated impedance 4 ohm with two 2 ohm coils: you choose how to wire them to match your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eBuilt for 25 mm of excursion\u003c\/b\u003e\n\u003cp\u003eCompressed paper + fibreglass cone, large “R” form suspension and a 203.6×5 Oz Y35 ferrite magnet: Xmax 25 mm, Bl 48.8 TM, 60 kg on the scale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eLook closer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_5883516c-1769-4333-9c3a-34d97d4cbe09.jpg?v=1790012930\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_5883516c-1769-4333-9c3a-34d97d4cbe09.jpg?v=1790012930\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_5883516c-1769-4333-9c3a-34d97d4cbe09.jpg?v=1790012930\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP Audio technician holding the SP 15XXX carbon fibre cone and large R form suspension in the workshop\" width=\"991\" height=\"1088\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eCone and suspension\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_fe24402d-1f78-4640-83ea-8c87c8d7697b.jpg?v=1790012930\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_fe24402d-1f78-4640-83ea-8c87c8d7697b.jpg?v=1790012930\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_fe24402d-1f78-4640-83ea-8c87c8d7697b.jpg?v=1790012930\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"Rear view of the SP 15XXX basket and ferrite magnet assembly on a car audio shop counter\" width=\"2048\" height=\"2048\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eMotor and magnet assembly\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15XXX\u003c\/div\u003e\n\u003cp\u003eWiring of the two voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15XXX-CARBON-Manual-EN-2026.pdf?v=1790621472\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003eOne \u003cb\u003eSP 15XXX\u003c\/b\u003e subwoofer — the price is for a single unit.\u003c\/li\u003e\n\u003cli\u003eThe full user manual in PDF, linked above, with the wiring diagram of the two voice coils.\u003c\/li\u003e\n\u003cli\u003eInvoice from an Italian company, shipping from our warehouse in Italy.\u003c\/li\u003e\n\u003cli\u003eFree technical support from Italy before and after the installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER AND LOAD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum impedance\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e10000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e20000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eACOUSTICS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity (1 W \/ 1 m)\u003c\/td\u003e\n\u003ctd\u003e86.2 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e18–250 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR AND MATERIALS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e4 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e280 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e203.6×5 Oz Y35 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge “R” form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight of one subwoofer\u003c\/td\u003e\n\u003ctd\u003e60 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e33 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.27\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e2.70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e21.8 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e876 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e0.03 mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e48.8 TM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e754.77 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPL\u003c\/td\u003e\n\u003ctd\u003e86.0 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eRECOMMENDED VENTED BOX\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e140 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency\u003c\/td\u003e\n\u003ctd\u003e28 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent diameter\u003c\/td\u003e\n\u003ctd\u003eØ 100×100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent length\u003c\/td\u003e\n\u003ctd\u003e44 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eRectangle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd correction\u003c\/td\u003e\n\u003ctd\u003eTwo flanged ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-15x-carbon-fiber-6000-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15X CARBON FIBERS — 6000 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-15cxxx-3500-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15CXXX BIG SURROUND — 3500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-12cx-2500-watt-rms-power\"\u003e\u003csmall\u003eSUBWOOFER 12\"\u003c\/small\u003e\u003cstrong\u003eSP 12CX — 2500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-4awg-100-ofc-32mm2-red\"\u003e\u003csmall\u003eRECOMMENDED CABLE\u003c\/small\u003e\u003cstrong\u003eSP 4GA RED 100% OFC\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e Rated impedance is 4 ohm, with two 2 ohm coils. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 10000 W RMS.\u003c\/b\u003e Sizing on the 20000 W PEAK figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e The product sheet gives a vented box of 140 L tuned to 28 Hz, vent Ø 100×100 mm and 44 cm long, two flanged ends: thick panels, braced and sealed, or the box will lose output and rattle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePlan the mounting and the handling.\u003c\/b\u003e One unit weighs 60 kg: the baffle and the fixings have to hold it, and it takes two people to fit it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e, with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15XXX handle?\u003c\/b\u003e10000 W RMS continuous and 20000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eRated impedance 4 ohm, with two 2 ohm voice coils. Use a mono amplifier able to deliver about 10000 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 4 inch, weight 60 kg.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhich box does it want?\u003c\/b\u003eThe product sheet gives a vented box of 140 L tuned to 28 Hz, rectangular, with a Ø 100×100 mm vent 44 cm long and two flanged ends.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15XXX handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"10000 W RMS continuous and 20000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Rated impedance 4 ohm, with two 2 ohm voice coils. Use a mono amplifier able to deliver about 10000 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 4 inch, weight 60 kg.\"}}, {\"@type\": \"Question\", \"name\": \"Which box does it want?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The product sheet gives a vented box of 140 L tuned to 28 Hz, rectangular, with a 100x100 mm vent 44 cm long and two flanged ends.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42855974011092,"sku":"16015","price":2100.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_0875c4e8-059c-437b-b1d7-e11f026b03b6.webp?v=1772086536"},{"product_id":"sp-15x-carbon-fiber-6000-watt-rms","title":"SP 15X Carbon Subwoofer 15\" 6000W RMS","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .cw figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:9px 12px 12px}.sp4 .cw figcaption b{color:#E8560F}.sp4 .cw figure{margin:0}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e6000 watt RMS.\u003cbr\u003e\u003cem\u003e4 inch voice coil.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm subwoofer built around a 4 inch voice coil: rated 4 ohm with 2+2 ohm coils, 6000 W RMS continuous, 12000 W peak, 84 dB SPL sensitivity, 25–300 Hz. Compressed paper + fibreglass cone, large “R” form suspension, 280 °C aluminium wire winding, 119×4 Oz Y35 ferrite magnet, Xmax 32.5 mm. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a293c1e7-7e8e-46db-a2c4-195fdc76a4a6.jpg?v=1790013792\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a293c1e7-7e8e-46db-a2c4-195fdc76a4a6.jpg?v=1790013792\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a293c1e7-7e8e-46db-a2c4-195fdc76a4a6.jpg?v=1790013792\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a293c1e7-7e8e-46db-a2c4-195fdc76a4a6.jpg?v=1790013792\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP 15X Carbon Fibers subwoofers installed behind the seats of a car at night\" width=\"1195\" height=\"896\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e6000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e12000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e84\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 4 INCH VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e XMAX 32.5 MM\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e6000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e12000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PEAK FIGURE IS A SHORT-TERM VALUE: SIZE THE AMPLIFIER ON THE 6000 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e6000 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 6000 W RMS is the power the voice coil handles continuously, with 12000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 4 inch voice coil\u003c\/b\u003e\n\u003cp\u003eThe bigger the coil, the more heat it dissipates and the longer it survives a real session. Wound with 280 °C aluminium wire.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eRated impedance 4 ohm with two 2 ohm coils: you choose how to wire them to match your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eBuilt for 32.5 mm of excursion\u003c\/b\u003e\n\u003cp\u003eCompressed paper + fibreglass cone, large “R” form suspension and a 119×4 Oz Y35 ferrite magnet: Xmax 32.5 mm, Bl 25.25 TM, Sd 754.77 cm².\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eLook closer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_9f7a6cbd-9568-42fa-be16-eb097b35fb62.jpg?v=1790013792\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_9f7a6cbd-9568-42fa-be16-eb097b35fb62.jpg?v=1790013792\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_9f7a6cbd-9568-42fa-be16-eb097b35fb62.jpg?v=1790013792\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP 15X cone and suspension on an SP Audio workshop bench with voice coils and tools\" width=\"2048\" height=\"2048\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eCone and suspension\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a7a0c534-e42a-4150-8491-9108d3dde023.jpg?v=1790013792\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a7a0c534-e42a-4150-8491-9108d3dde023.jpg?v=1790013792\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a7a0c534-e42a-4150-8491-9108d3dde023.jpg?v=1790013792\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"Basket and ferrite magnet assembly of the SP 15X subwoofer in a car audio shop\" width=\"1024\" height=\"1026\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eMotor and magnet assembly\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP 15X\u003c\/div\u003e\n\u003cp\u003eWiring of the two voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15X-CARBON-Manual-EN-2026.pdf?v=1790621472\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003eOne \u003cb\u003eSP 15X\u003c\/b\u003e subwoofer — the price is for a single unit.\u003c\/li\u003e\n\u003cli\u003eThe full user manual in PDF, linked above, with the wiring diagram of the two voice coils.\u003c\/li\u003e\n\u003cli\u003eInvoice from an Italian company, shipping from our warehouse in Italy.\u003c\/li\u003e\n\u003cli\u003eFree technical support from Italy before and after the installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER AND LOAD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum impedance\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e6000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e12000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eACOUSTICS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity (1 W \/ 1 m)\u003c\/td\u003e\n\u003ctd\u003e84 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e25–300 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR AND MATERIALS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e4 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e280 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e119×4 Oz Y35 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge “R” form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e31.4 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.634\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e5.088\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.724\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e32.61 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e32.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e634.73 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e0.04 mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e25.25 TM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e754.77 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPL\u003c\/td\u003e\n\u003ctd\u003e84.0 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eRECOMMENDED VENTED BOX\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e95 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency\u003c\/td\u003e\n\u003ctd\u003e31.4 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent diameter\u003c\/td\u003e\n\u003ctd\u003eØ 110 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent length\u003c\/td\u003e\n\u003ctd\u003e26.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eCircle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent cross area\u003c\/td\u003e\n\u003ctd\u003e88.2 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd correction\u003c\/td\u003e\n\u003ctd\u003eTwo flanged ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-15xxx-10-000-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15XXX CARBON FIBERS — 10000 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-15cxxx-3500-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15CXXX BIG SURROUND — 3500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-12cx-2500-watt-rms-power\"\u003e\u003csmall\u003eSUBWOOFER 12\"\u003c\/small\u003e\u003cstrong\u003eSP 12CX — 2500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-4awg-100-ofc-32mm2-red\"\u003e\u003csmall\u003eRECOMMENDED CABLE\u003c\/small\u003e\u003cstrong\u003eSP 4GA RED 100% OFC\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e Rated impedance is 4 ohm, with two 2 ohm coils. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 6000 W RMS.\u003c\/b\u003e Sizing on the 12000 W PEAK figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e The product sheet gives a vented box of 95 L tuned to 31.4 Hz, with a circular vent Ø 110 mm and 26.5 cm long, two flanged ends: thick panels, braced and sealed, or the box will lose output and rattle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLeave room for the excursion.\u003c\/b\u003e Xmax is 32.5 mm: check the clearance behind the cone and keep the mounting baffle rigid.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier,\u003c\/b\u003e with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP 15X handle?\u003c\/b\u003e6000 W RMS continuous and 12000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eRated impedance 4 ohm, with two 2 ohm voice coils. Use a mono amplifier able to deliver about 6000 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 4 inch, Xmax 32.5 mm.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhich box does it want?\u003c\/b\u003eThe product sheet gives a vented box of 95 L tuned to 31.4 Hz, with a circular vent Ø 110 mm, 26.5 cm long and two flanged ends.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP 15X handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"6000 W RMS continuous and 12000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Rated impedance 4 ohm, with two 2 ohm voice coils. Use a mono amplifier able to deliver about 6000 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15 inch), voice coil 4 inch, Xmax 32.5 mm.\"}}, {\"@type\": \"Question\", \"name\": \"Which box does it want?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The product sheet gives a vented box of 95 L tuned to 31.4 Hz, with a circular vent 110 mm, 26.5 cm long and two flanged ends.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SP Audio","offers":[{"title":"Default Title","offer_id":42855997898964,"sku":"15600","price":1389.99,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_bd349473-a1d1-4868-a80f-0438bc57780d.webp?v=1772086583"},{"product_id":"sp-15xxx-super-magnet","title":"SP-15X (ROCKET LINE SUBWOOFER) 15\"\/38CM - 24000 WATT (UNIT PRICE)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .cw figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:9px 12px 12px}.sp4 .cw figcaption b{color:#E8560F}.sp4 .cw figure{margin:0}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cdiv class=\"alt\" style=\"margin:14px 0 18px;background:#1a1a1a;border:1px solid #E8560F;border-left:4px solid #E8560F;border-radius:8px;padding:14px 16px\"\u003e\n\u003cp style=\"margin:0 0 12px;color:#E8E8E8;font-size:15px;line-height:1.5\"\u003eThe Rocket Line is temporarily unavailable. We recommend the SP-15X TiTANiUM: more power, 8000 W RMS instead of 7000 W RMS, in the same 15\" \/ 38 cm size.\u003c\/p\u003e\n\u003ca class=\"btn\" href=\"\/en\/products\/sp-15x-titanium-8000-watt-rms-price-unit\" style=\"display:inline-block;background:#E8560F;color:#ffffff;padding:12px 22px;border-radius:6px;font-weight:800;font-size:13px;letter-spacing:1px;text-transform:uppercase;text-decoration:none\"\u003eSee the SP-15X TiTANiUM\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · quad voice coil 1+1+1+1 ohm\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e7000 watt RMS.\u003cbr\u003e\u003cem\u003e24000 watt peak.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm subwoofer built for Bass Wars: 100 mm (4 inch) voice coil in a 4-layer configuration on a vented former, 1+1+1+1 ohm coils and 4 ohm rated impedance, 7000 W RMS continuous over 24h competitions and 24000 W peak, 86 dB SPL sensitivity, 25–300 Hz. Progressive double-layer spiders, non-pressed paper cone with cotton fibre, 203.6×5 Oz Y35 ferrite motor, push connectors up to 12 AWG, 80 kg per unit. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_7f52c2b0-f90a-4e4b-bf4e-d1f47d3fa865.jpg?v=1790007400\u0026amp;width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_7f52c2b0-f90a-4e4b-bf4e-d1f47d3fa865.jpg?v=1790007400\u0026amp;width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_7f52c2b0-f90a-4e4b-bf4e-d1f47d3fa865.jpg?v=1790007400\u0026amp;width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_7f52c2b0-f90a-4e4b-bf4e-d1f47d3fa865.jpg?v=1790007400\u0026amp;width=900 900w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt='SP-15X ROCKET LINE subwoofer 15\"\/38 cm on display in the SP Audio showroom' width=\"1024\" height=\"1024\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e7000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e24000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eMAX\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e86\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e QUAD VOICE COIL 1+1+1+1 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 4 INCH VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e XMAX 25 MM\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 29%;\"\u003e7000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMAX · PEAK\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e24000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE 24000 W FIGURE IS A SHORT-TERM PEAK VALUE: SIZE THE AMPLIFIER ON THE 7000 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e7000 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 7000 W RMS is the power the voice coil handles continuously, tested on 24h competitions, with 24000 W of peak headroom on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 100 mm voice coil, 4 layers\u003c\/b\u003e\n\u003cp\u003e4 inch of coil wound in a 4-layer configuration on a former with venting holes, in 280 °C aluminium wire: heat leaves the motor instead of staying inside it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eQuad voice coil 1+1+1+1 ohm\u003c\/b\u003e\n\u003cp\u003eRated impedance 4 ohm with four 1 ohm coils: you choose how to wire them to match your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eBuilt for Bass Wars\u003c\/b\u003e\n\u003cp\u003eProgressive double-layer spiders, oversized lead wires, a basket designed for thermal dissipation and mechanical strength, and a massive ferrite motor: Xmax 25 mm, Bl 48.8 TM, 80 kg on the scale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eLook closer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download.png?v=1790007400\u0026amp;width=620\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download.png?v=1790007400\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download.png?v=1790007400\u0026amp;width=620 620w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP-15X ROCKET LINE subwoofer held by an installer, cone and surround in view\" width=\"1120\" height=\"928\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eCone and suspension\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_f06c4b58-6dd5-4f9d-bcad-2618f19bee37.jpg?v=1790007401\u0026amp;width=620\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_f06c4b58-6dd5-4f9d-bcad-2618f19bee37.jpg?v=1790007401\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_f06c4b58-6dd5-4f9d-bcad-2618f19bee37.jpg?v=1790007401\u0026amp;width=620 620w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP-15X ROCKET LINE subwoofer on the workbench, basket, lead wires and ferrite motor\" width=\"960\" height=\"1112\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eMotor and magnet assembly\u003c\/b\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP-15X ROCKET LINE\u003c\/div\u003e\n\u003cp\u003eWiring of the four voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15X-ROCKET-LINE-Manual-EN-2026.pdf?v=1790621472\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003eOne \u003cb\u003eSP-15X ROCKET LINE\u003c\/b\u003e subwoofer — the price is for a single unit.\u003c\/li\u003e\n\u003cli\u003eThe full user manual in PDF, linked above, with the wiring diagram of the four voice coils.\u003c\/li\u003e\n\u003cli\u003eInvoice from an Italian company, shipping from our warehouse in Italy.\u003c\/li\u003e\n\u003cli\u003eFree technical support from Italy before and after the installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv class=\"ph\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_63a48315-dd0d-4a69-9148-5f9939a559c4.jpg?v=1790007401\u0026amp;width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_63a48315-dd0d-4a69-9148-5f9939a559c4.jpg?v=1790007401\u0026amp;width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_63a48315-dd0d-4a69-9148-5f9939a559c4.jpg?v=1790007401\u0026amp;width=560 560w\" sizes=\"(min-width:1000px) 50vw, 100vw\" alt=\"SP-15X ROCKET LINE subwoofer on its crate with power cable and terminals\" width=\"1024\" height=\"1024\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER AND LOAD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e380 mm (15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum impedance\u003c\/td\u003e\n\u003ctd\u003e1+1+1+1 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e7000 W (24h competitions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (MAX)\u003c\/td\u003e\n\u003ctd\u003e24000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eACOUSTICS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity (1 W \/ 1 m)\u003c\/td\u003e\n\u003ctd\u003e86 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e25–300 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR AND MATERIALS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e100 mm (4 inch), 4 layers, vented former\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003e280 °C aluminium wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003e203.6×5 Oz Y35 ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension\u003c\/td\u003e\n\u003ctd\u003eLarge “R” form, progressive double-layer spiders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone\u003c\/td\u003e\n\u003ctd\u003eCompressed paper + fibreglass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectors\u003c\/td\u003e\n\u003ctd\u003ePush connectors up to 12 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight of one subwoofer\u003c\/td\u003e\n\u003ctd\u003e80 kg (176.37 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e33 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.27\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e2.70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e21.8 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e876 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e0.03 mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e48.8 TM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e754.77 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPL\u003c\/td\u003e\n\u003ctd\u003e86.0 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eRECOMMENDED VENTED BOX\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e140 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency\u003c\/td\u003e\n\u003ctd\u003e28 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent diameter\u003c\/td\u003e\n\u003ctd\u003eØ 100×100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVent length\u003c\/td\u003e\n\u003ctd\u003e44 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eRectangle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd correction\u003c\/td\u003e\n\u003ctd\u003eTwo flanged ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-15xxx-10-000-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15XXX — 10000 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-15x-carbon-fiber-6000-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15X CARBON FIBER — 6000 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-15cxxx-3500-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\"\u003c\/small\u003e\u003cstrong\u003eSP 15CXXX — 3500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-4awg-100-ofc-32mm2-red\"\u003e\u003csmall\u003eRECOMMENDED CABLE\u003c\/small\u003e\u003cstrong\u003eSP 4GA RED 100% OFC\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e Rated impedance is 4 ohm, with four 1 ohm coils. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 7000 W RMS.\u003c\/b\u003e Sizing on the 24000 W peak figure means overdriving the coil: use the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e The product sheet gives a vented box of 140 L tuned to 28 Hz, vent Ø 100×100 mm and 44 cm long, two flanged ends: thick panels, braced and sealed, or the box will lose output and rattle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePlan the mounting and the handling.\u003c\/b\u003e One unit weighs 80 kg: the baffle and the fixings have to hold it, and it takes two people to fit it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e, with an inline fuse close to the battery and a ground point on bare metal. The push connectors accept up to 12 AWG.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP-15X ROCKET LINE handle?\u003c\/b\u003e7000 W RMS continuous, on 24h competitions, and 24000 W peak.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eRated impedance 4 ohm, with four 1 ohm voice coils. Use a mono amplifier able to deliver about 7000 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat size is it and how big is the voice coil?\u003c\/b\u003eNominal diameter 380 mm (15\"), voice coil 100 mm (4 inch) in 4 layers, weight 80 kg.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhich box does it want?\u003c\/b\u003eThe product sheet gives a vented box of 140 L tuned to 28 Hz, rectangular, with a Ø 100×100 mm vent 44 cm long and two flanged ends.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP-15X ROCKET LINE handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"7000 W RMS continuous, on 24h competitions, and 24000 W peak.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Rated impedance 4 ohm, with four 1 ohm voice coils. Use a mono amplifier able to deliver about 7000 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What size is it and how big is the voice coil?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Nominal diameter 380 mm (15\\\"), voice coil 100 mm (4 inch) in 4 layers, weight 80 kg.\"}}, {\"@type\": \"Question\", \"name\": \"Which box does it want?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The product sheet gives a vented box of 140 L tuned to 28 Hz, rectangular, with a 100x100 mm vent 44 cm long and two flanged ends.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"spaudio","offers":[{"title":"Default Title","offer_id":43192905171156,"sku":"16016","price":3450.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_a970435c-47ad-457e-9891-345a4d84ebad.webp?v=1772086477"},{"product_id":"sp-15x-neo-5000-watt-rms-unit-price","title":"SP-15X NEO . 5000 WATT RMS (PRICE UNIT)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .cw figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:9px 12px 12px}.sp4 .cw figcaption b{color:#E8560F}.sp4 .cw figure{margin:0}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003esubwoofer 15\" \/ 38 cm · dual voice coil 2+2 ohm · neodymium\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e5000 watt RMS.\u003cbr\u003e\u003cem\u003eNeodymium motor.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15\"\/38 cm high-excursion subwoofer on an N38H neodymium motor: 5000 W RMS, 10000 W continuous program power, 96 dB sensitivity, 4\" voice coil with CCAW four-layer winding, Xmax ±17.5 mm, carbon fibre cone with high-roll foam surround. Net weight 20.8 kg. Sold per unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e5000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e10000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003ePROGRAM\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e96\u003ci\u003edB\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eSENSITIVITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e N38H NEODYMIUM MOTOR\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e DUAL VOICE COIL 2+2 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e XMAX ±17.5 MM\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e5000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003ePROGRAM · CONTINUOUS PROGRAM\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e10000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS = CONTINUOUS POWER. THE PROGRAM FIGURE IS NOT RMS: SIZE THE AMPLIFIER ON THE 5000 W RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e5000 W RMS, continuous\u003c\/b\u003e\n\u003cp\u003eNot a burst figure: 5000 W RMS is the power the voice coil handles continuously, with 10000 W of continuous program power on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 4\" voice coil, CCAW four-layer\u003c\/b\u003e\n\u003cp\u003eA four-inch coil on an aluminium former, wound in four layers of CCAW over a 70 mm winding depth: the heat gets out and the coil stays alive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eDual voice coil 2+2 ohm\u003c\/b\u003e\n\u003cp\u003eTwo coils: in parallel 1 ohm, in series 4 ohm. You choose the impedance that matches your amplifier instead of the other way round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eNeodymium motor, far less weight\u003c\/b\u003e\n\u003cp\u003eAn N38H neodymium magnet stack on an aluminium heatsink basket: 20.8 kg net for 5000 W RMS, with Xmax ±17.5 mm of clean travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eUSER MANUAL SP-15X NEO\u003c\/div\u003e\n\u003cp\u003eWiring of the two voice coils, impedance, mounting and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15X-NEO-Manual-EN-2026.pdf?v=1790621523\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Open the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · English · 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003eOne \u003cb\u003eSP-15X NEO\u003c\/b\u003e subwoofer — the price is for a single unit.\u003c\/li\u003e\n\u003cli\u003eThe full user manual in PDF, linked above, with the wiring diagram of the two voice coils.\u003c\/li\u003e\n\u003cli\u003eInvoice from an Italian company, shipping from our warehouse in Italy.\u003c\/li\u003e\n\u003cli\u003eFree technical support from Italy before and after the installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eSUBWOOFER — SPECIFICATIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER AND LOAD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e15\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated impedance\u003c\/td\u003e\n\u003ctd\u003e2+2 ohm (dual voice coil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (RMS)\u003c\/td\u003e\n\u003ctd\u003e5000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous program power\u003c\/td\u003e\n\u003ctd\u003e10000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eSingle unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eACOUSTICS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity (1 W \/ 1 m)\u003c\/td\u003e\n\u003ctd\u003e96 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e33–500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR AND MATERIALS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd\u003e4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding material\u003c\/td\u003e\n\u003ctd\u003eCCAW, 4 layers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormer material\u003c\/td\u003e\n\u003ctd\u003eAluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding depth\u003c\/td\u003e\n\u003ctd\u003e70 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnetic gap depth\u003c\/td\u003e\n\u003ctd\u003e35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e±17.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurround material\u003c\/td\u003e\n\u003ctd\u003eCarbon fibre cone \/ high-roll foam surround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurround design\u003c\/td\u003e\n\u003ctd\u003eU-shape\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd\u003eN38H neodymium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOUNTING\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall diameter\u003c\/td\u003e\n\u003ctd\u003e390 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBolt circle\u003c\/td\u003e\n\u003ctd\u003e375 mm, 8 × Ø6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaffle cutout diameter\u003c\/td\u003e\n\u003ctd\u003e360 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth\u003c\/td\u003e\n\u003ctd\u003e315 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e20.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping weight\u003c\/td\u003e\n\u003ctd\u003e23.7 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping box (single)\u003c\/td\u003e\n\u003ctd\u003e470 × 470 × 450 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs — resonance frequency\u003c\/td\u003e\n\u003ctd\u003e32.73 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts — total Q\u003c\/td\u003e\n\u003ctd\u003e0.38\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e5.29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.41\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas — equivalent air load\u003c\/td\u003e\n\u003ctd\u003e42.43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms — moving mass\u003c\/td\u003e\n\u003ctd\u003e472.44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms — compliance\u003c\/td\u003e\n\u003ctd\u003e0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl — force factor\u003c\/td\u003e\n\u003ctd\u003e26.50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd — piston area\u003c\/td\u003e\n\u003ctd\u003e0.07\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRe — DC resistance\u003c\/td\u003e\n\u003ctd\u003e1 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eη0 — reference efficiency\u003c\/td\u003e\n\u003ctd\u003e0.13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER'S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eMONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI — 1500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-0ga-red-100-ofc-30m-spool\"\u003e\u003csmall\u003ePOWER CABLE\u003c\/small\u003e\u003cstrong\u003eSP 0GA RED 100% OFC — 30 M\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/kit-cable-0-awg\"\u003e\u003csmall\u003eCOMPLETE WIRING KIT\u003c\/small\u003e\u003cstrong\u003eSP KIT CABLE 0 AWG\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION BLOCK\u003c\/small\u003e\u003cstrong\u003eSP DB 01 — 1x0GA IN + 3x4GA OUT\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDecide the impedance before you wire it.\u003c\/b\u003e The two 2 ohm coils in parallel give 1 ohm, in series 4 ohm. Check that your amplifier is stable at the impedance you choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMatch the amplifier to 5000 W RMS.\u003c\/b\u003e The 10000 W figure is continuous program power, not RMS: size the amplifier on the RMS value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the enclosure rigid.\u003c\/b\u003e A 15\" cone with ±17.5 mm of travel loads the box hard: thick panels, braced and sealed. The sheet gives a baffle cutout of 360 mm and a depth of 315 mm: check them before you cut the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize the power cable for the amplifier\u003c\/b\u003e, with an inline fuse close to the battery and a ground point on bare metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much power does the SP-15X NEO handle?\u003c\/b\u003e5000 W RMS continuous, with 10000 W of continuous program power.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat impedance is it and which amplifier does it need?\u003c\/b\u003eDual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 5000 W RMS at the impedance you wire.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the price for one unit or for a pair?\u003c\/b\u003eThe price is for one single subwoofer.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat cutout and depth does it need?\u003c\/b\u003eOverall diameter 390 mm, baffle cutout 360 mm, depth 315 mm, bolt circle 375 mm with 8 holes of Ø6.5 mm.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat is the frequency range and how much does it weigh?\u003c\/b\u003e33–500 Hz with 96 dB sensitivity, net weight 20.8 kg.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much power does the SP-15X NEO handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"5000 W RMS continuous, with 10000 W of continuous program power.\"}}, {\"@type\": \"Question\", \"name\": \"What impedance is it and which amplifier does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Dual voice coil 2+2 ohm: wired in series it gives 4 ohm, in parallel 1 ohm. Use a mono amplifier able to deliver about 5000 W RMS at the impedance you wire.\"}}, {\"@type\": \"Question\", \"name\": \"Is the price for one unit or for a pair?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The price is for one single subwoofer.\"}}, {\"@type\": \"Question\", \"name\": \"What cutout and depth does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Overall diameter 390 mm, baffle cutout 360 mm, depth 315 mm, bolt circle 375 mm with 8 holes of Ø6.5 mm.\"}}, {\"@type\": \"Question\", \"name\": \"What is the frequency range and how much does it weigh?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"33–500 Hz with 96 dB sensitivity, net weight 20.8 kg.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"spaudio","offers":[{"title":"Default Title","offer_id":53936583934295,"sku":"15902","price":1812.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SP-15XNEO.webp?v=1783150502"},{"product_id":"sp-15x-titanium-8000-watt-rms-price-unit","title":"SP-15X TiTANiUM . 8000 WATT RMS (PRICE UNIT)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.sp4{background:#0B0B0B;color:#E8E8E8;border-radius:14px;overflow:hidden;font-size:16px;line-height:1.6}.sp4 img{display:block;width:100%;height:auto}.sp4 .band{background:#E8560F}.sp4 .pill{display:inline-block;background:#E8560F;color:#fff;font-size:9.5px;font-weight:800;letter-spacing:1.5px;padding:6px 10px;text-transform:uppercase;white-space:nowrap}.sp4 h2.big,.sp4 .sec h3,.sp4 .card b,.sp4 .faq b,.sp4 .pair strong{color:#fff}.sp4 .in,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .top,.sp4 .vids,.sp4 .rea{padding-left:22px;padding-right:22px}.sp4 .vids figure{margin:0 auto 16px;max-width:430px}.sp4 .vids video{display:block;width:100%;height:auto;background:#0B0B0B;border:1px solid #262626;border-radius:10px}.sp4 .vids figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:9px 2px 0;text-align:center}.sp4 .vids figcaption b{color:#E8560F}.sp4 .rea{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px;padding-bottom:4px}.sp4 .rea span{flex:1 1 150px;background:#161616;border:1px solid #262626;border-left:3px solid #E8560F;padding:9px 11px;font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:#d6d6d6;text-transform:uppercase}.sp4 .top{display:flex;align-items:center;justify-content:space-between;gap:14px}.sp4 .top img{width:186px;height:105px;flex:0 0 auto}.sp4 .trust{display:flex;flex-wrap:wrap;gap:8px;padding:8px 22px 0}.sp4 .trust span{flex:1 1 165px;background:#111;border:1px solid #232323;padding:8px 10px;font-size:10px;font-weight:800;letter-spacing:1.1px;color:#9d9d9d;text-transform:uppercase}.sp4 .trust b{color:#E8560F;font-weight:800}.sp4 .paym{padding:14px 22px 2px;font-size:9.5px;font-weight:800;letter-spacing:1.7px;line-height:1.8;color:#7a7a7a;text-transform:uppercase;text-align:center}@media screen and (min-width:1000px){.product{row-gap:0!important}.product-info{display:contents!important}.product-gallery{grid-column:1!important;grid-row:1\/span 99!important}.product-info__block-item{grid-column:2!important}.product-info__block-item[data-block-type=description]{grid-column:1\/-1!important;grid-row:100!important;margin-top:44px!important}.sp4{font-size:17px}.sp4 .in,.sp4 .top,.sp4 .tags,.sp4 .bar,.sp4 .cards,.sp4 .pair,.sp4 .foot,.sp4 .rea,.sp4 .sec,.sp4 .band,.sp4 .paym,.sp4 .fine,.sp4 .swipe,.sp4 .pnl,.sp4 .trust{padding-left:40px;padding-right:40px}.sp4 .frame,.sp4 .quote,.sp4 .dl,.sp4 .cw,.sp4 .tw,.sp4 .warn,.sp4 .faq,.sp4 .sup{margin-left:40px;margin-right:40px}.sp4 h2.big{font-size:66px}.sp4 .sub{max-width:66ch;font-size:17px}.sp4 .band b{font-size:46px}.sp4 .card{flex:1 1 300px}.sp4 .cards{gap:14px}.sp4 .pnl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.sp4 .tw,.sp4 .warn,.sp4 .sup{max-width:1040px;margin-left:auto;margin-right:auto}.sp4 .dl{max-width:780px;margin-left:auto;margin-right:auto}.sp4 .quote{max-width:1150px}.sp4 .faq{columns:2;column-gap:40px}.sp4 .faq div{break-inside:avoid}.sp4 .sec{margin-top:48px}.sp4 .swipe figure{flex:0 0 330px;max-width:330px}}\u003c\/style\u003e\n\u003cdiv class=\"sp4\"\u003e\n\u003cdiv class=\"top\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-audio-logo-mark.png?v=1788926315\u0026amp;width=380\" alt=\"SP Audio - Super Power Audio\" width=\"186\" height=\"105\" decoding=\"async\"\u003e\u003cspan class=\"rg\"\u003e\u003cb\u003eSUPER POWER AUDIO\u003c\/b\u003e\u003cbr\u003eDESIGNED IN ITALY\u003cbr\u003eMMXXVI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"in\"\u003e\n\u003cspan class=\"pill\"\u003e15\" \/ 38 cm · dual voice coil · SPL competition\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e8000 watt RMS.\u003cbr\u003e\u003cem\u003e56 kg of motor.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 15-inch competition subwoofer built around a 125 mm four-layer CCAW voice coil, a quad-stack ferrite motor 280 mm across and a pure carbon fibre cone. 8000 W RMS continuous, 26.75 Tm of force factor. Not a subwoofer you fit by accident.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"frame\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a4bbddf0-c587-4bc3-96ea-9f5298d2a325.jpg?width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a4bbddf0-c587-4bc3-96ea-9f5298d2a325.jpg?width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a4bbddf0-c587-4bc3-96ea-9f5298d2a325.jpg?width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_a4bbddf0-c587-4bc3-96ea-9f5298d2a325.jpg?width=900 900w\" sizes=\"(min-width:1000px) 900px, 100vw\" alt=\"SP-15X TiTANiUM 15-inch competition subwoofer with graffiti hydrographic basket and chrome motor\" width=\"1536\" height=\"2752\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"tri\"\u003e\n\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"band\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e8000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e125\u003ci\u003eMM\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003e4-LAYER CCAW COIL\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e26.75\u003ci\u003eTM\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eBL FORCE FACTOR\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eFree shipping\u003c\/span\u003e\u003cspan\u003eDispatched from Italy in 24–48 working hours\u003c\/span\u003e\u003cspan\u003eWarranty on manufacturing defects\u003c\/span\u003e\u003cspan\u003eFree technical support from Italy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e🔒\u003c\/b\u003e Secure checkout · SSL \u0026amp; PCI DSS\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e↩\u003c\/b\u003e 14 days to change your mind (EU)\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Invoice from an Italian company\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e ITALIAN DESIGN\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e CARBON FIBRE CONE\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 5\" \/ 125 MM VOICE COIL\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FREE SUPPORT\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e COMPETITION SPL\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003ePower, measured not promised\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS · CONTINUOUS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 50%;\"\u003e8000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eBURST · PEAK, NOT RMS\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e16000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eMANUFACTURER’S LABORATORY DATA · 8000 W IS THE CONTINUOUS RMS FIGURE · 16000 W IS A BURST FIGURE AND IS NOT RMS\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this subwoofer\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eA 125 mm voice coil, four layers\u003c\/b\u003e\n\u003cp\u003e5 inches of CCAW winding on a 155 mm former, 65 mm of winding height, DCR 1.8 + 1.8 ohm on the two coils. That is the surface that turns 8000 W RMS into movement instead of heat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eCarbon fibre, front and back\u003c\/b\u003e\n\u003cp\u003ePure carbon fibre cone with a ribbed high-roll surround and a 3D woven carbon fibre dust cap. Rigid where it must not flex, free where it must travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003e280 mm of motor, quad-stack\u003c\/b\u003e\n\u003cp\u003eFour 25 mm Y35 high-energy ferrite rings, a 280 × 20 mm T-yoke and a 35 mm chrome-plated top plate: 26.75 Tm of Bl and 56 kg on the scale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eBuilt to be driven hard\u003c\/b\u003e\n\u003cp\u003e6-layer progressive Nomex spider 250 mm across with heavy lead wires, anti-torsion die-cast aluminium basket, 8 × M8 mounting points. Every part is sized for the power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e“Continuous RMS only. No peak, no burst, no marketing watts.”\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003ePROFESSIONAL USER MANUAL\u003c\/div\u003e\n\u003cp\u003eWiring, enclosure design, break-in and full specifications.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-15X-TITANIUM-Manual-EN-2026.pdf?v=1790621472\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: #ffffff;\"\u003e\u003cspan style=\"display: inline-block; background: rgb(232, 86, 15); padding: 18px 36px; border-radius: 6px; letter-spacing: 1px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-transform: uppercase; box-shadow: rgba(232, 86, 15, 0.35) 0px 8px 24px;\"\u003e\u003cb\u003e⇩ Download the manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eThe box makes the bass\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e110 litres net, tuned to 34 Hz.\u003c\/b\u003e\n\u003cp\u003eThese are the manufacturer’s enclosure figures for the SP-15X TiTANiUM in a bass-reflex (ported) box. Build it to these numbers and the driver works as it was designed to work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_95daeb9f-7081-4adc-b0f3-c01f70731122.jpg?width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_95daeb9f-7081-4adc-b0f3-c01f70731122.jpg?width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_95daeb9f-7081-4adc-b0f3-c01f70731122.jpg?width=560 560w\" sizes=\"(min-width:1000px) 560px, 100vw\" alt=\"SP Audio workshop in Italy: technicians assembling SP-15X TiTANiUM motors and baskets\" width=\"2390\" height=\"1792\" loading=\"lazy\" decoding=\"async\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eEUROPEAN SPECS (METRIC)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet internal volume\u003c\/td\u003e\n\u003ctd\u003e110 Liters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort area\u003c\/td\u003e\n\u003ctd\u003e320 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort length\u003c\/td\u003e\n\u003ctd\u003e60 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency (Fb)\u003c\/td\u003e\n\u003ctd\u003e34 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eAMERICAN SPECS (IMPERIAL)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet internal volume\u003c\/td\u003e\n\u003ctd\u003e3.88 cu. ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort area\u003c\/td\u003e\n\u003ctd\u003e49.6 sq. in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort length\u003c\/td\u003e\n\u003ctd\u003e23.6 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning frequency (Fb)\u003c\/td\u003e\n\u003ctd\u003e34 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER HANDLING\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower handling\u003c\/td\u003e\n\u003ctd\u003e8000 W RMS \/ 16000 W burst\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e15\" \/ 38 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDescription\u003c\/td\u003e\n\u003ctd\u003eExtreme competition subwoofer for SPL and extreme low-frequency applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eTHIELE-SMALL (T\/S) PARAMETERS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFs\u003c\/td\u003e\n\u003ctd\u003e36.70 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBl\u003c\/td\u003e\n\u003ctd\u003e26.75 Tm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e3.341\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.505\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVas\u003c\/td\u003e\n\u003ctd\u003e31.98 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms\u003c\/td\u003e\n\u003ctd\u003e595.96 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSd\u003c\/td\u003e\n\u003ctd\u003e844.9 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms\u003c\/td\u003e\n\u003ctd\u003e31.55 μM\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPLo\u003c\/td\u003e\n\u003ctd\u003e87.1 dB (1 W \/ 1 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOTOR, COIL \u0026amp; MOVING ASSEMBLY\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil\u003c\/td\u003e\n\u003ctd\u003e5\" \/ 125 mm, 4-layer CCAW · ID 125 mm, OD 133 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil DCR\u003c\/td\u003e\n\u003ctd\u003e1.8 + 1.8 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormer \/ winding height\u003c\/td\u003e\n\u003ctd\u003e155 mm \/ 65 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet structure\u003c\/td\u003e\n\u003ctd\u003eQuad-stack Y35 high-energy ferrite, OD 280 mm, 4 × 25 mm rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTop plate (washer)\u003c\/td\u003e\n\u003ctd\u003eOD 280 mm × ID 133.5 mm × H 35 mm, high-permeability steel, chrome plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-yoke \u0026amp; pole piece\u003c\/td\u003e\n\u003ctd\u003eBase 280 × 20 mm, pole OD 122.5 mm × H 168 mm, forged low-carbon steel, chrome plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpider pack\u003c\/td\u003e\n\u003ctd\u003eOD 250 mm, 6-layer progressive Nomex with heavy lead wires\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCone assembly\u003c\/td\u003e\n\u003ctd\u003ePure carbon fibre cone, ribbed high-roll surround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDust cap\u003c\/td\u003e\n\u003ctd\u003e3D woven carbon fibre, full-cover structural cap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBasket frame\u003c\/td\u003e\n\u003ctd\u003eAnti-torsion custom die-cast aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMOUNTING \u0026amp; DIMENSIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting cutout diameter (A)\u003c\/td\u003e\n\u003ctd\u003e353 mm (13.90 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScrew pitch circle diameter (PCD)\u003c\/td\u003e\n\u003ctd\u003e~370 mm (14.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal height (C)\u003c\/td\u003e\n\u003ctd\u003e~260 mm (10.24 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting depth (D)\u003c\/td\u003e\n\u003ctd\u003e~255 mm (10.04 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor diameter (F)\u003c\/td\u003e\n\u003ctd\u003e280 mm (11.02 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor depth (E)\u003c\/td\u003e\n\u003ctd\u003e~155 mm (6.10 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting hardware\u003c\/td\u003e\n\u003ctd\u003e8 × M8 screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eWEIGHT\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e56.0 kg (123.5 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross weight, crated\u003c\/td\u003e\n\u003ctd\u003e59.0 kg (130.0 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\" style=\"padding-top: 10px;\"\u003eMANUFACTURER’S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS AND ARE NOT LISTED AS SUCH\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e05\u003c\/u\u003e\n\u003ch3\u003eComplete the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/en\/products\/sp-0awg-100-ofc-58mm2-red\"\u003e\u003csmall\u003ePOWER CABLE 0 GA\u003c\/small\u003e\u003cstrong\u003eSP 0GA RED 100% OFC\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/spmanl-02\"\u003e\u003csmall\u003eLINE PROTECTION\u003c\/small\u003e\u003cstrong\u003eSP MAN 02 fuse holder 0 GA\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/bag-fuse-400a\"\u003e\u003csmall\u003eANL FUSES 400 A\u003c\/small\u003e\u003cstrong\u003eSP ANL 400A · 24 pcs\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003ePOWER DISTRIBUTION\u003c\/small\u003e\u003cstrong\u003eSP DB 01 · 1×0 GA in, 3×4 GA out\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eBefore you install it\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eTwo people to install it.\u003c\/b\u003e The driver weighs 56 kg net: a 2-technician installation is required, and the baffle has to carry that weight for the life of the car.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBuild the box in 25 mm minimum.\u003c\/b\u003e Birch ply or MDF, 25 mm (1\") minimum, with mandatory internal bracing. A double or triple baffle, 50 mm (2\") or more, under the driver.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFix it with M8 or M10 and T-nuts.\u003c\/b\u003e Eight mounting points, machine screws into T-nuts — never wood screws into the baffle edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBreak it in: 20 hours or more\u003c\/b\u003e at moderate volume before any competition run. The suspension has to settle before it sees full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFeed it properly.\u003c\/b\u003e 8000 W RMS needs 0 GA power and ground, an inline fuse within 20 cm of the battery sized to the cable, and a charging system to match.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eQuestions installers ask\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat amplifier does the SP-15X TiTANiUM need?\u003c\/b\u003eIt is rated 8000 W RMS. Match the amplifier to the continuous RMS figure, not to the burst figure, and wire the two 1.8 ohm coils to the load your amplifier is stable at. Ask us and we will check the combination with you.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhich enclosure should I build?\u003c\/b\u003eBass-reflex: 110 litres net internal volume, 320 cm² of port area, 60 cm of port length, tuned to 34 Hz (3.88 cu. ft., 49.6 sq. in., 23.6 in).\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the voice coil dual?\u003c\/b\u003eYes: a 5\" \/ 125 mm four-layer CCAW coil measuring 1.8 + 1.8 ohm DCR, on a 155 mm former with 65 mm of winding height.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow much space does it need?\u003c\/b\u003e353 mm cutout, ~370 mm screw pitch circle, ~255 mm mounting depth and ~260 mm total height. The motor alone is 280 mm across.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs the cone really carbon fibre?\u003c\/b\u003eYes: a pure carbon fibre cone with a ribbed high-roll surround and a 3D woven carbon fibre dust cap. TiTANiUM is the model name — the published materials are the ones listed in the specifications above.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support from Italy.\u003c\/b\u003e Write or call and a person answers, with the real data of the product sheets. Tell us what you want to build — impedance, power, box litres, crossover points — and we will help you match it.\u003cbr\u003e\u003ca href=\"mailto:spaudio@spaudio.it\"\u003espaudio@spaudio.it\u003c\/a\u003e · +39 340 807 8778\u003c\/div\u003e\n\u003cp class=\"paym\"\u003eAccepted payment methods\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP Audio — Super Power Audio. Designed in Italy by Audiocar Import \u0026amp; Export SRLS, Milano, official SP Audio distributor for Europe.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What amplifier does the SP-15X TiTANiUM need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is rated 8000 W RMS. Match the amplifier to the continuous RMS figure, not to the burst figure, and wire the two 1.8 ohm coils to the load your amplifier is stable at. Ask us and we will check the combination with you.\"}}, {\"@type\": \"Question\", \"name\": \"Which enclosure should I build?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Bass-reflex: 110 litres net internal volume, 320 cm² of port area, 60 cm of port length, tuned to 34 Hz (3.88 cu. ft., 49.6 sq. in., 23.6 in).\"}}, {\"@type\": \"Question\", \"name\": \"Is the voice coil dual?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes: a 5 inch \/ 125 mm four-layer CCAW coil measuring 1.8 + 1.8 ohm DCR, on a 155 mm former with 65 mm of winding height.\"}}, {\"@type\": \"Question\", \"name\": \"How much space does it need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"353 mm cutout, ~370 mm screw pitch circle, ~255 mm mounting depth and ~260 mm total height. The motor alone is 280 mm across.\"}}, {\"@type\": \"Question\", \"name\": \"Is the cone really carbon fibre?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes: a pure carbon fibre cone with a ribbed high-roll surround and a 3D woven carbon fibre dust cap. TiTANiUM is the model name - the published materials are the ones listed in the specifications above.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"spaudio","offers":[{"title":"Default Title","offer_id":53936584524119,"sku":"16018","price":1989.24,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/TiTANIO.webp?v=1783150569"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/collections\/SUB_15.webp?v=1771658558","url":"https:\/\/spaudiothailandia.com\/en\/collections\/subwoofer-15.oembed","provider":"spaudio","version":"1.0","type":"link"}