{"product_id":"sp-50-4-4channel-plug-and-play-price-unit","title":"SP-50×4 - 4CHANNEL PLUG AND PLAY (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 .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}.sp4 .pnl{padding:4px 22px 0}.sp4 .pnl figure{margin:0 0 14px;background:#131313;border:1px solid #232323;border-radius:9px;padding:12px}.sp4 .pnl figcaption{font-size:10.5px;letter-spacing:1.4px;color:#9d9d9d;text-transform:uppercase;padding:10px 2px 0;text-align:center;line-height:1.7}.sp4 .pnl figcaption b{color:#fff;display:block;font-size:12px;letter-spacing:2px;margin-bottom:4px}@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\"\u003e4-CHANNEL PLUG AND PLAY · 16-PIN OEM HARNESS\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003eSP-50×4 — a real amplifier on the factory harness\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eFour channels, \u003cb\u003e4 × 50 W RMS at 4 Ω per channel\u003c\/b\u003e, six analogue tone trims and a full pass-through: the head unit plugs into \u003cb\u003eTO HEAD UNIT\u003c\/b\u003e, the car’s own harness plugs into \u003cb\u003eTO AUTOMOTIVE\u003c\/b\u003e, and every factory feature keeps working exactly as before. No RCA cabling, no separate power block, no gain calibration. 151 × 103 × 45 mm, 0.6 kg.\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_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=760\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=440 440w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=620 620w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=900 900w\" sizes=\"(max-width: 700px) 100vw, 700px\" alt=\"SP-50x4 4-channel plug and play amplifiers on a workshop bench, control panel and RCA output panel\" width=\"2524\" height=\"1664\" 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\u003e50\u003ci\u003eW×4\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS · 4 Ω PER CHANNEL\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e6\u003ci\u003eTRIM\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eFRONT \u0026amp; REAR HIGH-MID-LOW\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e16\u003ci\u003ePIN\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eOEM HARNESS PASS-THROUGH\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Dispatched in \u003cb\u003e48 working hours\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Official SP AUDIO distributor for Europe\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Technical support from a real person\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Data taken from the factory manual, Rev. 1.0\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tags\"\u003e\n\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 4 × 50 W RMS at 4 Ω\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 16-pin speaker-level input\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e TO AUTOMOTIVE pass-through\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 6 tone trims F\/R × high-mid-low\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e RCA FL-OUT \/ FR-OUT for a subwoofer\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e HI\/ACC turn-on selector\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e Input sensitivity 0.2 – 6 V\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 20 Hz – 20 kHz\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e S\/N ≥ 88 dB\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e THD \u0026lt; 0.1%\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 151 × 103 × 45 mm\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e 0.6 kg\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e01\u003c\/u\u003e\n\u003ch3\u003eWhat the four channels actually deliver\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eRMS power output — 4 channels at 4 Ω\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e4 × 50 W RMS\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eTotal harmonic distortion\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 12%;\"\u003e\u0026lt; 0.1% THD\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eSignal-to-noise ratio\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 88%;\"\u003e≥ 88 dB\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eFrequency response\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 100%;\"\u003e20 Hz – 20 kHz\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eInput sensitivity\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 60%;\"\u003e0.2 – 6 V\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003e\u003cb\u003e4 × 50 W RMS at 4 Ω per channel\u003c\/b\u003e — continuous power, confirmed by SP Audio, not a burst figure. This is what the four channels hold all day into a factory speaker set, which is exactly the load the amplifier is built around: 4 Ω is the minimum per channel. Everything else on this page comes from the SP-50×4 professional user manual, Rev. 1.0, September 2026.\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy plug and play changes the job\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eOne connector, not a wiring loom\u003c\/b\u003e\n\u003cp\u003ePower, turn-on and all four speaker-level signal pairs travel through a single 16-pin harness cable. No RCA runs down the sills, no separate power block at the battery, no gain calibration procedure. A typical install is measured in tens of minutes, not in an afternoon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eThe factory head unit keeps every feature\u003c\/b\u003e\n\u003cp\u003eThe car’s original connector goes into \u003cb\u003eTO HEAD UNIT\u003c\/b\u003e; the vehicle harness goes into \u003cb\u003eTO AUTOMOTIVE\u003c\/b\u003e. Display, chimes, steering-wheel controls, reverse-gear and illumination lines pass straight through. The amplifier sits invisibly in the middle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eSix trims: enough control without a laptop\u003c\/b\u003e\n\u003cp\u003eFRONT and REAR each get HIGH, MID and LOW. Front and rear speakers sit at different distances and behind different trim panels, so they never sound identical out of the box — two independent trim sets let you keep the front stage dominant and correct the rear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eRoom to grow: FL-OUT \/ FR-OUT\u003c\/b\u003e\n\u003cp\u003eA pair of RCA pre-amp outputs feeds a separate subwoofer amplifier or an active subwoofer, so the system can gain a sub later without touching the factory wiring again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eHonest about what it is not\u003c\/b\u003e\n\u003cp\u003eThese are continuously-variable analogue tone trims, not a parametric DSP: no adjustable crossover points, no delay, no EQ curve you can draw. They will balance a factory speaker set noticeably better than leaving everything flat — they will not replace a dedicated processor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eCompact enough to disappear\u003c\/b\u003e\n\u003cp\u003e151 × 103 × 45 mm and 0.6 kg: under a seat, behind a dash panel, in the boot side panel — wherever the factory harness connector is easiest to reach. Two mounting points, aluminium fins for cooling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"quote\"\u003e«A factory harness install still deserves a real amplifier.»\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e03\u003c\/u\u003e\n\u003ch3\u003eEvery control, panel by panel\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\/sp-50x4-panel-input.jpg?width=700\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-input.jpg?width=480 480w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-input.jpg?width=700 700w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-input.jpg?width=1000 1000w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-input.jpg?width=1200 1200w\" sizes=\"(max-width: 700px) 92vw, 620px\" alt=\"SP-50x4 control and input panel: six tone trims, TO HEAD UNIT and TO AUTOMOTIVE 16-pin ports\" width=\"1200\" height=\"625\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eCONTROL \u0026amp; INPUT PANEL\u003c\/b\u003e1–3 FRONT HIGH \/ MID \/ LOW · 4–6 REAR HIGH \/ MID \/ LOW\u003cbr\u003e7 TO HEAD UNIT (16-pin, from the factory head unit) · 8 TO AUTOMOTIVE (16-pin, on to the car)\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-output.jpg?width=700\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-output.jpg?width=480 480w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-output.jpg?width=700 700w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-output.jpg?width=1000 1000w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/sp-50x4-panel-output.jpg?width=1200 1200w\" sizes=\"(max-width: 700px) 92vw, 620px\" alt=\"SP-50x4 output panel: FL-OUT and FR-OUT RCA pre-amp outputs and HI\/ACC turn-on selector\" width=\"1200\" height=\"625\" loading=\"lazy\" decoding=\"async\"\u003e\n\u003cfigcaption\u003e\u003cb\u003eOUTPUT PANEL\u003c\/b\u003e1 FL-OUT · 2 FR-OUT — RCA pre-amp outputs for a subwoofer amplifier\u003cbr\u003e3 HI\/ACC — slide switch: high-level auto turn-on or ignition (ACC) turn-on\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rea\"\u003e\n\u003cspan\u003eOrder matters: head unit → TO HEAD UNIT\u003c\/span\u003e\u003cspan\u003eCar harness → TO AUTOMOTIVE\u003c\/span\u003e\u003cspan\u003eTrims centred before first power-up\u003c\/span\u003e\u003cspan\u003eWhen in doubt, start on HI\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dl\"\u003e\n\u003cdiv class=\"k\"\u003eTHE COMPLETE MANUAL, 21 PAGES\u003c\/div\u003e\n\u003cp\u003eSafety, the full 16-pin pinout with wire colours, mounting, the tuning procedure, the troubleshooting table and the factory specification sheet. Read it before the first cable is cut.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SP-50x4-user-manual-EN.pdf?v=1788932617\" 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 SP-50×4 manual (PDF)\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003cp class=\"n\"\u003ePDF · 1.0 MB · English · Rev. 1.0, September 2026\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e04\u003c\/u\u003e\n\u003ch3\u003eWhat is in the box\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eOne box, one harness, four channels\u003c\/b\u003e\n\u003cp\u003eThe SP-50×4 ships ready to slot between a factory head unit and the car’s original speaker harness. Check the carton on unboxing: no dents on the fins, both bumpers intact, both 16-pin ports clear of debris, and both connector shells clicking firmly with no bent pins.\u003c\/p\u003e\n\u003cp class=\"sm\"\u003e\u003cb\u003eIncluded:\u003c\/b\u003e SP-50×4 amplifier ×1 · 16-pin harness cable ×1 · mounting screws Ø4×16 mm ×2 · user manual ×1\u003cbr\u003e\u003cb\u003eNot included:\u003c\/b\u003e the vehicle-side harness adapter if your factory connector differs, speaker cable extensions and any subwoofer cable — these are installation materials and depend on the car.\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_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=560\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=380 380w, https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/download_4f42d80b-79cd-45f2-9510-1adfc43d45ce.jpg?width=560 560w\" sizes=\"(max-width: 700px) 92vw, 340px\" alt=\"SP-50x4 amplifier with its finned chassis on a wooden workbench\" width=\"2524\" height=\"1664\" loading=\"lazy\" decoding=\"async\"\u003e\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\"\u003ePOWER OUTPUT\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRMS power output\u003c\/td\u003e\n\u003ctd\u003e4 × 50 W RMS at 4 Ω per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal harmonic distortion\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.1% THD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum load per channel\u003c\/td\u003e\n\u003ctd\u003e4 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eAUDIO\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e20 Hz – 20 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal-to-noise ratio\u003c\/td\u003e\n\u003ctd\u003e≥ 88 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput sensitivity\u003c\/td\u003e\n\u003ctd\u003e0.2 – 6 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput type\u003c\/td\u003e\n\u003ctd\u003eHigh-level (speaker-level), 16-pin harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePre-amp sub output\u003c\/td\u003e\n\u003ctd\u003eRCA FL-OUT \/ FR-OUT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eCONNECTIONS \u0026amp; CONTROL\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHarness ports\u003c\/td\u003e\n\u003ctd\u003eTO HEAD UNIT (in) · TO AUTOMOTIVE (pass-through out)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTurn-on selector\u003c\/td\u003e\n\u003ctd\u003eHI \/ ACC slide switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTone trims\u003c\/td\u003e\n\u003ctd\u003e6 × continuously-variable analogue trims (FRONT and REAR × HIGH \/ MID \/ LOW)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical system\u003c\/td\u003e\n\u003ctd\u003e12 V negative ground only — not for 24 V vehicles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eMECHANICAL\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (L × H × W)\u003c\/td\u003e\n\u003ctd\u003e151 × 103 × 45 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e0.6 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting points\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis\u003c\/td\u003e\n\u003ctd\u003eAluminium, finned, black with orange SP AUDIO mark\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eIN THE BOX\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded cable\u003c\/td\u003e\n\u003ctd\u003e16-pin harness cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting hardware\u003c\/td\u003e\n\u003ctd\u003eMounting screw Ø4×16 mm ×2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDocumentation\u003c\/td\u003e\n\u003ctd\u003eProfessional user manual, 21 pages\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;\"\u003ePower is \u003cb\u003e4 × 50 W RMS at 4 Ω per channel\u003c\/b\u003e, continuous, as confirmed by SP Audio. Every other figure on this page comes from the SP-50×4 professional user manual, Rev. 1.0, September 2026. One note: the \u003cb\u003eamplifier class\u003c\/b\u003e is not formally published in the factory documentation, so we do not state one here rather than guess. Specifications may change without notice.\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e06\u003c\/u\u003e\n\u003ch3\u003eThe 16-pin harness, pin by pin\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tw\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePIN\u003c\/th\u003e\n\u003cth\u003eSIGNAL\u003c\/th\u003e\n\u003cth\u003eWIRE COLOUR \u0026amp; FUNCTION\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eBATT+\u003c\/td\u003e\n\u003ctd\u003eYellow — +12 V power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eGND\u003c\/td\u003e\n\u003ctd\u003eBlack — ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003eILL\u003c\/td\u003e\n\u003ctd\u003eOrange — illumination detection line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003eACC\u003c\/td\u003e\n\u003ctd\u003eRed — ignition (accessory) wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003eKEY2\u003c\/td\u003e\n\u003ctd\u003eBrown — steering-wheel control line 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e“BLACK”\u003c\/td\u003e\n\u003ctd\u003ePink — reverse-gear detection line. Printed by the factory as “BLACK”: it is \u003cb\u003enot\u003c\/b\u003e a ground. Confirm it on a multimeter before wiring.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003eANT\u003c\/td\u003e\n\u003ctd\u003eBlue — automatic antenna power supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003eKEY1\u003c\/td\u003e\n\u003ctd\u003eOrange\/Black — steering-wheel control line 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003eRL−\u003c\/td\u003e\n\u003ctd\u003eGreen\/Black — rear-left speaker −\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003eRL+\u003c\/td\u003e\n\u003ctd\u003eGreen — rear-left speaker +\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003eFR−\u003c\/td\u003e\n\u003ctd\u003eGrey\/Black — front-right speaker −\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003eFR+\u003c\/td\u003e\n\u003ctd\u003eGrey — front-right speaker +\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003ctd\u003eRR+\u003c\/td\u003e\n\u003ctd\u003ePurple — rear-right speaker +\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003eRR−\u003c\/td\u003e\n\u003ctd\u003ePurple\/Black — rear-right speaker −\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003eFL−\u003c\/td\u003e\n\u003ctd\u003eWhite\/Black — front-left speaker −\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003eFL+\u003c\/td\u003e\n\u003ctd\u003eWhite — front-left speaker +\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;\"\u003eColours are as printed by the manufacturer for the \u003cb\u003esupplied\u003c\/b\u003e harness cable. The vehicle-side factory harness may use completely different colours for the same function: match by pin position and function, verified with a multimeter, never by colour alone. The four speaker pairs carry the head unit’s amplified speaker output, not a low-level RCA signal — this is what lets the SP-50×4 work with no RCA cabling at all.\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e07\u003c\/u\u003e\n\u003ch3\u003eBuild the rest of the system\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pair\"\u003e\n\u003ca href=\"\/fa\/products\/sp-1500-1-mini-amplifier\"\u003e\u003csmall\u003eADD THE SUBWOOFER — MONO AMPLIFIER\u003c\/small\u003e\u003cstrong\u003eSP-1500.1 MINI\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/fa\/products\/sp-6-5cx-coaxial-speaker\"\u003e\u003csmall\u003eREPLACE THE FACTORY SPEAKERS — 6.5″ COAXIAL\u003c\/small\u003e\u003cstrong\u003eSP 6.5CX\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/fa\/products\/sp-6-5kit-componet-set\"\u003e\u003csmall\u003eFULL FRONT STAGE — 2-WAY COMPONENT KIT\u003c\/small\u003e\u003cstrong\u003eSP 6.5 KIT\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/fa\/products\/sr-100-bt-usb-fm-mp3-receiver\"\u003e\u003csmall\u003eCHANGE THE SOURCE — BT\/USB\/FM RECEIVER + DSP\u003c\/small\u003e\u003cstrong\u003eSR-100\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e08\u003c\/u\u003e\n\u003ch3\u003eRead this before you install\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"warn\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDisconnect the battery first.\u003c\/b\u003e Remove the negative terminal before touching any factory harness plug, and reconnect it last.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e4 Ω minimum per channel.\u003c\/b\u003e Lower impedances can trigger protection and, repeated, damage the output stage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e12 V negative-ground vehicles only.\u003c\/b\u003e Never on a 24 V truck, never on mains power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe fins are the cooling system.\u003c\/b\u003e Free air all round: never under thick carpet, never inside a sealed cavity or a subwoofer box, never near the exhaust or heater ducts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eNever bypass or upgrade the on-board fuses.\u003c\/b\u003e Use identical replacement ratings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eConnect the right way round.\u003c\/b\u003e Factory head unit → TO HEAD UNIT; vehicle harness → TO AUTOMOTIVE. Reversing them does not damage the amplifier, but the pass-through features will not work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSecure both mounting points.\u003c\/b\u003e A loose amplifier is a projectile in a collision.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDo not open the chassis.\u003c\/b\u003e There are no user-serviceable parts inside and opening it voids the warranty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProfessional installation.\u003c\/b\u003e Damage caused by improper installation is not covered by warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e09\u003c\/u\u003e\n\u003ch3\u003eQuestions we actually get asked\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eWill I lose the steering-wheel controls or the display?\u003c\/b\u003eNo. That is the whole point of the pass-through: the factory connector goes into TO HEAD UNIT and the car’s harness goes into TO AUTOMOTIVE, so display, chimes, steering-wheel controls, illumination and reverse-gear lines carry on working exactly as before. Test them before you close the dash panel.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eDo I need RCA cables or a separate power cable to the battery?\u003c\/b\u003eNeither. The single 16-pin harness cable carries +12 V, ground, turn-on and all four speaker-level signal pairs. That is what makes the install fast.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eIs 4 × 50 W RMS or peak power?\u003c\/b\u003eRMS. \u003cb\u003e4 × 50 W RMS at 4 Ω per channel\u003c\/b\u003e, continuous on all four channels — confirmed by SP Audio, not a burst or peak figure. Minimum load is 4 Ω per channel: it is designed around the impedance of a factory speaker set.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat amplifier class is it?\u003c\/b\u003eThe factory documentation for the SP-50×4 does not formally publish an amplifier class, so we do not state one. If that figure matters for your project, write to us and we will ask the factory rather than guess on this page.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eCan I add a subwoofer later?\u003c\/b\u003eYes. FL-OUT and FR-OUT are RCA pre-amp outputs: feed a separate mono subwoofer amplifier or an active subwoofer from them, with no change to the factory wiring.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eHI or ACC — which turn-on mode?\u003c\/b\u003eStart with HI: the amplifier senses the speaker-level signal and switches itself on, so it needs no dedicated ignition wire. Move to ACC only if turn-on is slow or the amplifier fails to sense a very quiet factory source at start-up.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eCan it replace a DSP?\u003c\/b\u003eNo, and we would rather say so. The six trims are analogue tone controls on the high, mid and low portions of each output — no crossover points, no time alignment, no EQ curve. For that, look at the SR-100 or a dedicated processor.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat is pin 6, the one printed “BLACK”?\u003c\/b\u003eIt is a reverse-gear detection line, not a ground, and the label really is printed that way in the factory documentation. It is unusual enough that we say it out loud: confirm its function on a multimeter before wiring it into anything.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eHow fast do you ship?\u003c\/b\u003eOrders are prepared and handed to the courier within 24 to 48 working hours of payment being confirmed. You get the tracking number as soon as the parcel leaves.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sup\"\u003e\n\u003cb\u003eFree technical support, from a person who knows the product.\u003c\/b\u003e Tell us your car and your factory harness and we will help you get it right — before you buy, not after.\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\"\u003eSECURE PAYMENT\u003cbr\u003eVisa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna\u003c\/p\u003e\n\u003cp class=\"fine\"\u003eSP AUDIO · Audiocar Import \u0026amp; Export SRLS — Official SP AUDIO Distributor for Europe · Piazza IV Novembre 4, 20124 Milano (MI), Italy · VAT IT13085510967. All technical data on this page is the manufacturer’s declared data from the SP-50×4 professional user manual Rev. 1.0 (September 2026) and may change without notice.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Will I lose the steering-wheel controls or the display with the SP-50x4?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The SP-50x4 is a pass-through: the factory head-unit connector plugs into TO HEAD UNIT and the vehicle harness into TO AUTOMOTIVE, so display, chimes, steering-wheel controls, illumination and reverse-gear lines keep working as before.\"}},{\"@type\":\"Question\",\"name\":\"Does the SP-50x4 need RCA cables or a separate power cable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. A single 16-pin harness cable carries +12 V, ground, turn-on and all four speaker-level signal pairs.\"}},{\"@type\":\"Question\",\"name\":\"Is the SP-50x4 4 x 50 W RMS or peak power?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"RMS. The SP-50x4 delivers 4 x 50 W RMS at 4 ohm per channel, continuous on all four channels, as confirmed by SP Audio. Minimum load is 4 ohm per channel.\"}},{\"@type\":\"Question\",\"name\":\"Can I add a subwoofer to the SP-50x4?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. FL-OUT and FR-OUT are RCA pre-amp outputs for a separate mono subwoofer amplifier or an active subwoofer.\"}},{\"@type\":\"Question\",\"name\":\"Should I use HI or ACC turn-on on the SP-50x4?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Start with HI, which senses the speaker-level signal and needs no dedicated ignition wire. Use ACC if turn-on is slow or the amplifier fails to sense a very quiet factory source.\"}},{\"@type\":\"Question\",\"name\":\"Is the SP-50x4 a DSP?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It has six analogue tone trims (FRONT and REAR, each HIGH, MID and LOW) with no crossover points, time alignment or EQ curve. It balances a factory speaker set but does not replace a dedicated processor.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"spaudio","offers":[{"title":"Default Title","offer_id":53936587506007,"sku":"40654","price":117.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SP-50x4-4CHANNELPLUGANDPLAY.webp?v=1783150780","url":"https:\/\/spaudio.it\/fa\/products\/sp-50-4-4channel-plug-and-play-price-unit","provider":"spaudio","version":"1.0","type":"link"}