{"product_id":"ruthless-audio-800-4-4-channel-car-audio-amplifier","title":"Ruthless Audio 800.4 – 4-Channel 800W RMS Full-Range Car Audio Amplifier","description":"\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"b3de507d-a75f-4ba2-bd2c-ae3c75234935\" data-testid=\"conversation-turn-38\" data-scroll-anchor=\"true\" data-turn=\"assistant\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"665ed699-a398-4cb4-9fa6-7ac76ebc3f02\" dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-1-thinking\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full break-words dark markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"101\"\u003e\u003cstrong data-start=\"0\" data-end=\"74\"\u003eRuthless Audio 800.4 4-Channel 800W RMS Full-Range Car Audio Amplifier\u003c\/strong\u003e\u003cbr data-start=\"74\" data-end=\"77\"\u003eSold by AudioSellerz.com\u003c\/p\u003e\n\u003cp data-start=\"103\" data-end=\"574\"\u003eIf you need a strong full-range amplifier for mids, highs, or a full speaker setup, the \u003cstrong data-start=\"191\" data-end=\"215\"\u003eRuthless Audio 800.4\u003c\/strong\u003e is built for exactly that kind of system. This \u003cstrong data-start=\"263\" data-end=\"310\"\u003eKorean-designed Class D 4-channel amplifier\u003c\/strong\u003e is made for daily drivers, front-stage upgrades, pro audio door builds, and demo setups that need real power, real tuning control, and clean output. Shop more \u003cstrong data-start=\"470\" data-end=\"514\"\u003eRuthless Audio amplifiers and subwoofers\u003c\/strong\u003e here:\u003cbr data-start=\"520\" data-end=\"523\"\u003e\u003ca data-start=\"523\" data-end=\"574\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/audiosellerz.com\/collections\/ruthless-audio\"\u003ehttps:\/\/audiosellerz.com\/collections\/ruthless-audio\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse fill=\"currentColor\" href=\"\/cdn\/assets\/sprites-core-97566a9e.svg#304883\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-start=\"576\" data-end=\"1005\"\u003eThe \u003cstrong data-start=\"580\" data-end=\"598\"\u003eRuthless 800.4\u003c\/strong\u003e delivers the kind of flexibility that makes it useful in a wide range of builds. It is rated at \u003cstrong data-start=\"695\" data-end=\"721\"\u003e100 watts x4 at 4 ohms\u003c\/strong\u003e, \u003cstrong data-start=\"723\" data-end=\"749\"\u003e220 watts x4 at 2 ohms\u003c\/strong\u003e, and \u003cstrong data-start=\"755\" data-end=\"789\"\u003e440 watts x2 at 4 ohms bridged\u003c\/strong\u003e on \u003cstrong data-start=\"793\" data-end=\"802\"\u003e14.4V\u003c\/strong\u003e. That means the \u003cstrong data-start=\"819\" data-end=\"847\"\u003eRuthless Audio 800.4 amp\u003c\/strong\u003e is just as comfortable powering a full active front stage as it is running pro audio mids, coaxial speakers, or even a pair of small subs in the right setup.\u003c\/p\u003e\n\u003cp data-start=\"1007\" data-end=\"1369\"\u003eOne of the biggest reasons the \u003cstrong data-start=\"1038\" data-end=\"1082\"\u003eRuthless Audio 800.4 4-channel amplifier\u003c\/strong\u003e stands out is that it gives you both usable power and real crossover control. This is not just a basic 4-channel amp for stock replacement speakers. It is a serious option for people who want to build a louder, cleaner, more controlled system with the tuning flexibility to do it right.\u003c\/p\u003e\n\u003cp data-start=\"1371\" data-end=\"1687\"\u003eThe \u003cstrong data-start=\"1375\" data-end=\"1393\"\u003eRuthless 800.4\u003c\/strong\u003e uses \u003cstrong data-start=\"1399\" data-end=\"1427\"\u003eTiffany-style RCA inputs\u003c\/strong\u003e for strong, noise-resistant signal transfer and \u003cstrong data-start=\"1476\" data-end=\"1511\"\u003e4-gauge power and ground inputs\u003c\/strong\u003e for dependable current flow. It also operates on \u003cstrong data-start=\"1561\" data-end=\"1574\"\u003e8V to 16V\u003c\/strong\u003e, which gives it the range needed for real-world car audio systems where voltage can vary depending on the build.\u003c\/p\u003e\n\u003cp data-start=\"1689\" data-end=\"2223\"\u003eWhen it comes to tuning, the \u003cstrong data-start=\"1718\" data-end=\"1742\"\u003eRuthless Audio 800.4\u003c\/strong\u003e has the controls needed to dial in a proper speaker system. It features \u003cstrong data-start=\"1815\" data-end=\"1852\"\u003einput sensitivity from 6V to 0.2V\u003c\/strong\u003e, a \u003cstrong data-start=\"1856\" data-end=\"1895\"\u003ehigh-pass filter from 20Hz to 800Hz\u003c\/strong\u003e with an \u003cstrong data-start=\"1904\" data-end=\"1940\"\u003ex10 multiplier for 200Hz to 8kHz\u003c\/strong\u003e, and a \u003cstrong data-start=\"1948\" data-end=\"1986\"\u003elow-pass filter from 50Hz to 800Hz\u003c\/strong\u003e with an \u003cstrong data-start=\"1995\" data-end=\"2031\"\u003ex10 multiplier for 500Hz to 8kHz\u003c\/strong\u003e. That makes this amp a strong choice for \u003cstrong data-start=\"2073\" data-end=\"2091\"\u003emids and highs\u003c\/strong\u003e, \u003cstrong data-start=\"2093\" data-end=\"2116\"\u003efull-range speakers\u003c\/strong\u003e, \u003cstrong data-start=\"2118\" data-end=\"2141\"\u003eactive front stages\u003c\/strong\u003e, and \u003cstrong data-start=\"2147\" data-end=\"2186\"\u003epro audio style door speaker builds\u003c\/strong\u003e where crossover flexibility matters.\u003c\/p\u003e\n\u003cp data-start=\"2225\" data-end=\"2524\"\u003eIt also includes a \u003cstrong data-start=\"2244\" data-end=\"2267\"\u003eclip light function\u003c\/strong\u003e to help set gains correctly, which is a useful feature when you are trying to get the most out of your speakers without pushing the signal too far. For people building loud daily systems or more serious front-stage setups, that extra control is a big plus.\u003c\/p\u003e\n\u003cp data-start=\"2526\" data-end=\"2927\"\u003eThe \u003cstrong data-start=\"2530\" data-end=\"2554\"\u003eRuthless Audio 800.4\u003c\/strong\u003e is designed with \u003cstrong data-start=\"2572\" data-end=\"2590\"\u003elow distortion\u003c\/strong\u003e, with \u003cstrong data-start=\"2597\" data-end=\"2632\"\u003eTHD at 4 ohms greater than 0.01\u003c\/strong\u003e listed in the provided specs, and a \u003cstrong data-start=\"2669\" data-end=\"2697\"\u003e100A fuse is recommended\u003c\/strong\u003e. Whether you are upgrading a daily driver, building a loud front stage, or powering pro audio speakers in the doors, this amp is built to give you strong, clean output with the flexibility to match a wide range of speaker setups.\u003c\/p\u003e\n\u003cp data-start=\"2929\" data-end=\"3153\"\u003eIf you are planning the rest of your system, wiring and install accessories matter too. Shop our \u003cstrong data-start=\"3026\" data-end=\"3080\"\u003eSky High Car Audio amp kits and wiring accessories\u003c\/strong\u003e here:\u003cbr data-start=\"3086\" data-end=\"3089\"\u003e\u003ca data-start=\"3089\" data-end=\"3153\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/audiosellerz.com\/collections\/sky-high-car-audio-amp-kits\"\u003ehttps:\/\/audiosellerz.com\/collections\/sky-high-car-audio-amp-kits\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse fill=\"currentColor\" href=\"\/cdn\/assets\/sprites-core-97566a9e.svg#304883\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-start=\"3155\" data-end=\"3381\"\u003eIf you need help understanding speaker wiring and system planning for a 4-channel amplifier, read our \u003cstrong data-start=\"3257\" data-end=\"3291\"\u003ecar audio wiring diagram guide\u003c\/strong\u003e here:\u003cbr data-start=\"3297\" data-end=\"3300\"\u003e\u003ca data-start=\"3300\" data-end=\"3381\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/audiosellerz.com\/blogs\/audio-sellerz-blogs\/car-audio-wiring-diagram-guide\"\u003ehttps:\/\/audiosellerz.com\/blogs\/audio-sellerz-blogs\/car-audio-wiring-diagram-guide\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse fill=\"currentColor\" href=\"\/cdn\/assets\/sprites-core-97566a9e.svg#304883\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-start=\"3383\" data-end=\"3520\"\u003eIf the build is growing into a larger electrical upgrade, shop our \u003cstrong data-start=\"3450\" data-end=\"3464\"\u003eBig 3 Kits\u003c\/strong\u003e here:\u003cbr data-start=\"3470\" data-end=\"3473\"\u003e\u003ca data-start=\"3473\" data-end=\"3520\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/audiosellerz.com\/collections\/big-3-kits\"\u003ehttps:\/\/audiosellerz.com\/collections\/big-3-kits\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse fill=\"currentColor\" href=\"\/cdn\/assets\/sprites-core-97566a9e.svg#304883\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-start=\"3522\" data-end=\"3730\"\u003eIf you need charging support for a stronger overall system, shop our \u003cstrong data-start=\"3591\" data-end=\"3614\"\u003eBrand X Alternators\u003c\/strong\u003e here:\u003cbr data-start=\"3620\" data-end=\"3623\"\u003e\u003ca data-start=\"3623\" data-end=\"3730\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/audiosellerz.com\/collections\/brand-x-electrical-alternators-batteries-high-output-charging-upgrades\"\u003ehttps:\/\/audiosellerz.com\/collections\/brand-x-electrical-alternators-batteries-high-output-charging-upgrades\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse fill=\"currentColor\" href=\"\/cdn\/assets\/sprites-core-97566a9e.svg#304883\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-start=\"3732\" data-end=\"3928\"\u003eYou can also learn more about charging support for bigger systems in our \u003cstrong data-start=\"3805\" data-end=\"3836\"\u003ehigh output alternator blog\u003c\/strong\u003e here:\u003cbr data-start=\"3842\" data-end=\"3845\"\u003e\u003ca data-start=\"3845\" data-end=\"3928\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/audiosellerz.com\/blogs\/audio-sellerz-blogs\/high-output-alternator-car-audio\"\u003ehttps:\/\/audiosellerz.com\/blogs\/audio-sellerz-blogs\/high-output-alternator-car-audio\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse fill=\"currentColor\" href=\"\/cdn\/assets\/sprites-core-97566a9e.svg#304883\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-start=\"3930\" data-end=\"4022\"\u003e\u003cstrong data-start=\"3930\" data-end=\"3952\"\u003eRMS Power at 14.4V\u003c\/strong\u003e\u003cbr data-start=\"3952\" data-end=\"3955\"\u003e100W x4 at 4 ohms\u003cbr data-start=\"3972\" data-end=\"3975\"\u003e220W x4 at 2 ohms\u003cbr data-start=\"3992\" data-end=\"3995\"\u003e440W x2 at 4 ohms bridged\u003c\/p\u003e\n\u003cp data-start=\"4024\" data-end=\"4157\"\u003e\u003cstrong data-start=\"4024\" data-end=\"4042\"\u003eAmplifier Type\u003c\/strong\u003e\u003cbr data-start=\"4042\" data-end=\"4045\"\u003eKorean-designed Class D 4-channel full-range amplifier\u003cbr data-start=\"4099\" data-end=\"4102\"\u003eBuilt for mids, highs, and full-range speaker systems\u003c\/p\u003e\n\u003cp data-start=\"4159\" data-end=\"4287\"\u003e\u003cstrong data-start=\"4159\" data-end=\"4191\"\u003eSignal and Power Connections\u003c\/strong\u003e\u003cbr data-start=\"4191\" data-end=\"4194\"\u003eTiffany-style RCA inputs\u003cbr data-start=\"4218\" data-end=\"4221\"\u003e4-gauge power and ground inputs\u003cbr data-start=\"4252\" data-end=\"4255\"\u003eOperational voltage: 8V to 16V\u003c\/p\u003e\n\u003cp data-start=\"4289\" data-end=\"4533\"\u003e\u003cstrong data-start=\"4289\" data-end=\"4318\"\u003eControls and Audio Tuning\u003c\/strong\u003e\u003cbr data-start=\"4318\" data-end=\"4321\"\u003eInput sensitivity: 6V to 0.2V\u003cbr data-start=\"4350\" data-end=\"4353\"\u003eHigh-pass filter: 20Hz to 800Hz\u003cbr data-start=\"4384\" data-end=\"4387\"\u003ex10 multiplier: 200Hz to 8kHz\u003cbr data-start=\"4416\" data-end=\"4419\"\u003eLow-pass filter: 50Hz to 800Hz\u003cbr data-start=\"4449\" data-end=\"4452\"\u003ex10 multiplier: 500Hz to 8kHz\u003cbr data-start=\"4481\" data-end=\"4484\"\u003eClip light function to help set gains correctly\u003c\/p\u003e\n\u003cp data-start=\"4535\" data-end=\"4654\"\u003e\u003cstrong data-start=\"4535\" data-end=\"4570\"\u003eProtection and Recommended Fuse\u003c\/strong\u003e\u003cbr data-start=\"4570\" data-end=\"4573\"\u003eLow distortion design\u003cbr data-start=\"4594\" data-end=\"4597\"\u003eTHD at 4 ohms greater than 0.01\u003cbr data-start=\"4628\" data-end=\"4631\"\u003e100A fuse recommended\u003c\/p\u003e\n\u003cp data-start=\"4656\" data-end=\"4920\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eIf you want a \u003cstrong data-start=\"4670\" data-end=\"4702\"\u003eRuthless Audio 4-channel amp\u003c\/strong\u003e that can handle \u003cstrong data-start=\"4719\" data-end=\"4737\"\u003emids and highs\u003c\/strong\u003e, \u003cstrong data-start=\"4739\" data-end=\"4763\"\u003efront-stage speakers\u003c\/strong\u003e, \u003cstrong data-start=\"4765\" data-end=\"4790\"\u003epro audio door setups\u003c\/strong\u003e, and \u003cstrong data-start=\"4796\" data-end=\"4828\"\u003efull-range car audio systems\u003c\/strong\u003e with real tuning flexibility and solid power, the \u003cstrong data-start=\"4879\" data-end=\"4903\"\u003eRuthless Audio 800.4\u003c\/strong\u003e is a strong fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e","brand":"Ruthless Audio","offers":[{"title":"Default Title","offer_id":43741222699148,"sku":"","price":319.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/5076\/8524\/files\/IMG_0008.webp?v=1745089697","url":"https:\/\/audiosellerz.com\/products\/ruthless-audio-800-4-4-channel-car-audio-amplifier","provider":"Audio Sellerz","version":"1.0","type":"link"}