{"product_id":"copy-of-sp-2500-1d-2-ohm","title":"SP-3500.1D - @1 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\"\u003e1 channel · class D · monoblock\u003c\/span\u003e\n\u003ch2 class=\"big d\"\u003e3500 watt RMS.\u003cbr\u003e\u003cem\u003einto 1 ohm.\u003c\/em\u003e\n\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eOne channel, one subwoofer, all the current the car can give. Class D monoblock with forced cooling, variable filters and full protection — built for systems where the limiting factor is no longer the amplifier, but the electrical system behind it.\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\u003e3500\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS · 1 Ω MONO\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e1800\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS · 2 Ω MONO\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e1000\u003ci\u003eW\u003c\/i\u003e\u003c\/b\u003e\u003cspan\u003eRMS · 4 Ω MONO\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 CLASS D MONOBLOCK\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FORCED COOLING\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e✓\u003c\/b\u003e FULL PROTECTION\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\u003eMONO · 4 Ω\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 29%;\"\u003e1000 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMONO · 2 Ω\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil\" style=\"width: 51%;\"\u003e1800 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bar\"\u003e\n\u003cspan\u003eMONO · 1 Ω\u003c\/span\u003e\n\u003cdiv class=\"trk\"\u003e\n\u003cdiv class=\"fil mx\" style=\"width: 100%;\"\u003e3500 W\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"foot\"\u003eRMS @ 14.4 V · CONTINUOUS POWER, NOT BURST · MINIMUM LOAD 1 Ω\u003c\/p\u003e\n\u003cdiv class=\"sec\"\u003e\n\u003cu\u003e02\u003c\/u\u003e\n\u003ch3\u003eWhy this amplifier\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cards\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eAll the current on one channel\u003c\/b\u003e\n\u003cp\u003eA single class D output stage delivers 3500 W RMS into 1 ohm: no bridging, no power split between two channels. Everything goes to the subwoofer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eForced cooling, not just fins\u003c\/b\u003e\n\u003cp\u003eSmart cooling system with a temperature-driven fan on top of the finned chassis. The fan only spins when the amplifier asks for it, and the output stage keeps working when the music does not stop.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eFilters and levels on board\u003c\/b\u003e\n\u003cp\u003eVariable low-pass 80 Hz – 10 kHz, high-pass 15 Hz – 80 Hz, bass boost 0 – 12 dB at 50 Hz and gain, all on the panel. An RCA output passes the signal on to a second amplifier and a port takes the remote level control.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cb\u003eProtected, not fragile\u003c\/b\u003e\n\u003cp\u003eProtection against output short circuit, high supply voltage, low supply voltage and overheating. It works from 9 V to 16 V, so a starting dip does not become a repair.\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 · PDF\u003c\/div\u003e\n\u003cp\u003eWiring, loads and impedance, filters and gain calibration.\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/SPAUDIO-SP-3500.1D-1OHM-Manual-EN-2026.pdf?v=1790452652\" 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\u003eWhat you receive\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cw\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eAmplifier first, installation material second.\u003c\/b\u003e\n\u003cp\u003eThe SP-3500.1D arrives ready to be mounted: chassis with four fixing feet, direct-insert screw terminals and the complete control panel. Everything that goes around it — cable, fuse, ground, distribution — is chosen on the car, not on the amplifier.\u003c\/p\u003e\n\u003cp class=\"sm\"\u003e\u003cb\u003eIn the box:\u003c\/b\u003e amplifier · user manual (PDF above) · protective packaging.\u003cbr\u003e\u003cb\u003eNot included:\u003c\/b\u003e power and speaker cable, inline fuse holder, RCA cable, distribution block and remote level control — installation material, chosen for your vehicle.\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\"\u003ePOWER PER CHANNEL — RMS @ 14.4 V\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMono 1 ohm\u003c\/td\u003e\n\u003ctd\u003e3500 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMono 2 ohm\u003c\/td\u003e\n\u003ctd\u003e1800 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMono 4 ohm\u003c\/td\u003e\n\u003ctd\u003e1000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum load\u003c\/td\u003e\n\u003ctd\u003e1 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTopology\u003c\/td\u003e\n\u003ctd\u003eClass D, mono, 1 channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003ePOWER SUPPLY \u0026amp; PROTECTION\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply voltage\u003c\/td\u003e\n\u003ctd\u003e9 V – 16 V (12 V negative ground)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemote turn-on\u003c\/td\u003e\n\u003ctd\u003e+12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower input terminals\u003c\/td\u003e\n\u003ctd\u003e1 × GND \/ REM \/ +12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal management\u003c\/td\u003e\n\u003ctd\u003eSmart cooling system, temperature-driven fan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtections\u003c\/td\u003e\n\u003ctd\u003eOutput short circuit, high voltage, low voltage, thermal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eFILTERS \u0026amp; INPUTS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow-pass filter (LPF)\u003c\/td\u003e\n\u003ctd\u003e80 Hz – 10 kHz, variable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh-pass filter (HPF)\u003c\/td\u003e\n\u003ctd\u003e15 Hz – 80 Hz, variable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBass boost\u003c\/td\u003e\n\u003ctd\u003e0 – 12 dB at 50 Hz, variable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e10 Hz – 20 kHz (3 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eS\/N ratio\u003c\/td\u003e\n\u003ctd\u003e100 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput sensitivity\u003c\/td\u003e\n\u003ctd\u003e200 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput impedance\u003c\/td\u003e\n\u003ctd\u003e56 kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs \/ outputs\u003c\/td\u003e\n\u003ctd\u003eRCA input · RCA output · remote level control port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\"\u003eDIMENSIONS\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions L × W × H\u003c\/td\u003e\n\u003ctd\u003e228 × 219 × 74 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSold as\u003c\/td\u003e\n\u003ctd\u003eUnit\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\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-15cxxx-3500-watt-rms\"\u003e\u003csmall\u003eSUBWOOFER 15\" \/ 38 CM\u003c\/small\u003e\u003cstrong\u003eSP 15CXXX — 3500 W RMS\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/kit-cable-0-awg\"\u003e\u003csmall\u003eRECOMMENDED CABLE 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 30 M SPOOL\u003c\/small\u003e\u003cstrong\u003eSP 0GA RED 100% OFC\u003c\/strong\u003e\u003c\/a\u003e\u003ca href=\"\/en\/products\/sp-db-01\"\u003e\u003csmall\u003eDISTRIBUTION\u003c\/small\u003e\u003cstrong\u003eSP DB 01 · 1×0GA IN, 3×4GA 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\u003eCable section and fuse come first.\u003c\/b\u003e On an amplifier of this class the run from the battery is normally 0 AWG, with a main fuse within 20 cm of the battery sized to the cable. An undersized cable is the most common cause of voltage drop and disappointing bass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGround on clean metal, short.\u003c\/b\u003e Scrape the paint off, use the same section as the positive and keep the ground lead as short as you can. Most “noise problems” are ground problems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLeave the fan and the fins free.\u003c\/b\u003e The amplifier cools itself with a temperature-driven fan and a finned chassis: never cover it with carpet, luggage or foam, and leave air around it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSet the gain last, and set it as a match, not a volume.\u003c\/b\u003e Bass boost at 0, source at about three quarters, then raise the gain until it is loud and clean, and stop there. The supply must stay between 9 V and 16 V while it plays.\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\u003eWhich subwoofer impedance should I use?\u003c\/b\u003eAny load down to 1 ohm: 1 ohm = 3500 W RMS · 2 ohm = 1800 W RMS · 4 ohm = 1000 W RMS. Below 1 ohm the protection steps in and, if it is repeated, the output stage is damaged.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eDo I need to upgrade the battery and the alternator?\u003c\/b\u003eThe data sheet gives the supply range (9 V – 16 V), not the current draw. On this power class, plan the electrical system first: cable section, main fuse, a clean ground and a battery and alternator that keep the voltage up while the amplifier plays.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhich filters does it have?\u003c\/b\u003eLow-pass 80 Hz – 10 kHz, high-pass 15 Hz – 80 Hz and bass boost 0 – 12 dB centred on 50 Hz, all variable on the panel, plus the gain.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eCan I connect a second amplifier to it?\u003c\/b\u003eYes: the panel has an RCA output next to the RCA input, so the signal can be passed on to another amplifier without a splitter.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWhat are the dimensions?\u003c\/b\u003e228 × 219 × 74 mm, with four fixing feet. The power input is a single GND \/ REM \/ +12 V terminal block.\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\": \"Which subwoofer impedance should I use — SP-3500.1D\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Any load down to 1 ohm: 1 ohm = 3500 W RMS · 2 ohm = 1800 W RMS · 4 ohm = 1000 W RMS. Below 1 ohm the protection steps in and, if it is repeated, the output stage is damaged.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need to upgrade the battery and the alternator — SP-3500.1D\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The data sheet gives the supply range (9 V – 16 V), not the current draw. On this power class, plan the electrical system first: cable section, main fuse, a clean ground and a battery and alternator that keep the voltage up while the amplifier plays.\"}}, {\"@type\": \"Question\", \"name\": \"Which filters does it have — SP-3500.1D\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Low-pass 80 Hz – 10 kHz, high-pass 15 Hz – 80 Hz and bass boost 0 – 12 dB centred on 50 Hz, all variable on the panel, plus the gain.\"}}, {\"@type\": \"Question\", \"name\": \"Can I connect a second amplifier to it — SP-3500.1D\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes: the panel has an RCA output next to the RCA input, so the signal can be passed on to another amplifier without a splitter.\"}}, {\"@type\": \"Question\", \"name\": \"What are the dimensions — SP-3500.1D\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"228 × 219 × 74 mm, with four fixing feet. The power input is a single GND \/ REM \/ +12 V terminal block.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"spaudio","offers":[{"title":"Default Title","offer_id":47858373951831,"sku":"40006","price":10954.0,"currency_code":"MXN","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0645\/6829\/5636\/files\/1_a434a2a1-3b50-4090-a8b1-b2bdf1df3ea8.webp?v=1771937823","url":"https:\/\/spaudio.com.mx\/en\/products\/copy-of-sp-2500-1d-2-ohm","provider":"spaudio","version":"1.0","type":"link"}