{"product_id":"ruthless-audio-15-3-coil-subwoofer-quad-stack-motor","title":"Ruthless Audio 15\" 3\" Coil Subwoofer Quad Stack Motor","description":"\u003csection 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 [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:f7d3f95a-c84a-4d63-889e-3ef38af01e37-14\" data-testid=\"conversation-turn-30\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--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\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"42b08df1-32f7-4cd2-ac70-b950ece01571\" dir=\"auto\" data-message-model-slug=\"gpt-5-4-thinking\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word dark markdown-new-styling\"\u003e\n\u003cp data-start=\"342\" data-end=\"430\"\u003e\u003cstrong data-start=\"342\" data-end=\"403\"\u003eRuthless Audio Quad Stack Subwoofer 15\" and 18\" 2500W RMS\u003c\/strong\u003e\u003cbr data-start=\"403\" data-end=\"406\"\u003eSold by AudioSellerz.com\u003c\/p\u003e\n\u003cp data-start=\"432\" data-end=\"964\"\u003eIf you are building a serious bass setup and need a subwoofer that can handle real abuse, the \u003cstrong data-start=\"526\" data-end=\"555\"\u003eRuthless Audio Quad Stack\u003c\/strong\u003e is built for exactly that kind of system. Available in \u003cstrong data-start=\"611\" data-end=\"626\"\u003e15\" and 18\"\u003c\/strong\u003e sizes and rated at \u003cstrong data-start=\"646\" data-end=\"664\"\u003e2500 watts RMS\u003c\/strong\u003e, the \u003cstrong data-start=\"670\" data-end=\"703\"\u003eRuthless Quad Stack subwoofer\u003c\/strong\u003e is made for bassheads who want strong daily performance, real durability, and the kind of output that also works in competition-style SPL builds. Shop more \u003cstrong data-start=\"860\" data-end=\"904\"\u003eRuthless Audio subwoofers and amplifiers\u003c\/strong\u003e here:\u003cbr data-start=\"910\" data-end=\"913\"\u003e\u003ca data-start=\"913\" data-end=\"964\" 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=\"966\" data-end=\"1347\"\u003eThe \u003cstrong data-start=\"970\" data-end=\"996\"\u003eRuthless Quad Stack 15\u003c\/strong\u003e and \u003cstrong data-start=\"1001\" data-end=\"1027\"\u003eRuthless Quad Stack 18\u003c\/strong\u003e were engineered for people who want real low-end authority without giving up strength or reliability. Built from the ground up with \u003cstrong data-start=\"1160\" data-end=\"1174\"\u003eU.S. steel\u003c\/strong\u003e, \u003cstrong data-start=\"1176\" data-end=\"1203\"\u003eCNC precision machining\u003c\/strong\u003e, and an \u003cstrong data-start=\"1212\" data-end=\"1235\"\u003eFEA-optimized motor\u003c\/strong\u003e, this subwoofer is designed to deliver hard-hitting bass for both daily systems and competition-focused builds.\u003c\/p\u003e\n\u003cp data-start=\"1349\" data-end=\"1784\"\u003eRated at \u003cstrong data-start=\"1358\" data-end=\"1376\"\u003e2500 watts RMS\u003c\/strong\u003e, the \u003cstrong data-start=\"1382\" data-end=\"1421\"\u003eRuthless Audio Quad Stack subwoofer\u003c\/strong\u003e is available in \u003cstrong data-start=\"1438\" data-end=\"1454\"\u003edual 0.7 ohm\u003c\/strong\u003e and \u003cstrong data-start=\"1459\" data-end=\"1475\"\u003edual 1.7 ohm\u003c\/strong\u003e impedance options, giving you flexibility when matching your final load to the amplifier you plan to run. If you need help figuring out the right wiring setup for your build, read our \u003cstrong data-start=\"1660\" data-end=\"1694\"\u003ecar audio wiring diagram guide\u003c\/strong\u003e here:\u003cbr data-start=\"1700\" data-end=\"1703\"\u003e\u003ca data-start=\"1703\" data-end=\"1784\" 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=\"1786\" data-end=\"2166\"\u003eOne of the biggest highlights of the \u003cstrong data-start=\"1823\" data-end=\"1846\"\u003eRuthless Quad Stack\u003c\/strong\u003e is the motor design. It uses \u003cstrong data-start=\"1876\" data-end=\"1906\"\u003equad stack ferrite magnets\u003c\/strong\u003e that are \u003cstrong data-start=\"1916\" data-end=\"1967\"\u003ecut on a water jet and finish-machined in-house\u003c\/strong\u003e, delivering serious motor force for demanding bass setups. That strong motor structure helps the \u003cstrong data-start=\"2065\" data-end=\"2098\"\u003eRuthless Audio Quad Stack 15\"\u003c\/strong\u003e and \u003cstrong data-start=\"2103\" data-end=\"2110\"\u003e18\"\u003c\/strong\u003e stay aggressive and controlled when power levels climb.\u003c\/p\u003e\n\u003cp data-start=\"2168\" data-end=\"2455\"\u003eCooling is also a major part of the design. The \u003cstrong data-start=\"2216\" data-end=\"2255\"\u003eRuthless Audio Quad Stack subwoofer\u003c\/strong\u003e uses a \u003cstrong data-start=\"2263\" data-end=\"2306\"\u003esolid pole with staged aluminum cooling\u003c\/strong\u003e to help with thermal control under heavy load. That matters in any build where the subwoofer is expected to see real power for long periods of time.\u003c\/p\u003e\n\u003cp data-start=\"2457\" data-end=\"2800\"\u003eThe rest of the moving assembly is built for hard use. This subwoofer features a \u003cstrong data-start=\"2538\" data-end=\"2574\"\u003ekraft pulp fiber reinforced cone\u003c\/strong\u003e paired with a \u003cstrong data-start=\"2589\" data-end=\"2622\"\u003edual-layer wide foam surround\u003c\/strong\u003e to support strong output and long excursion. It also uses a \u003cstrong data-start=\"2683\" data-end=\"2717\"\u003e3\" diameter 4-layer voice coil\u003c\/strong\u003e and \u003cstrong data-start=\"2722\" data-end=\"2747\"\u003e5 progressive spiders\u003c\/strong\u003e for stability and control when the system is pushed.\u003c\/p\u003e\n\u003cp data-start=\"2802\" data-end=\"3281\"\u003eThe structure is just as serious. The \u003cstrong data-start=\"2840\" data-end=\"2863\"\u003eRuthless Quad Stack\u003c\/strong\u003e uses an \u003cstrong data-start=\"2872\" data-end=\"2908\"\u003eextra heavy-duty aluminum basket\u003c\/strong\u003e with a \u003cstrong data-start=\"2916\" data-end=\"2938\"\u003ewrap-around gasket\u003c\/strong\u003e for durability, along with \u003cstrong data-start=\"2966\" data-end=\"2992\"\u003e144-count tinsel leads\u003c\/strong\u003e that are \u003cstrong data-start=\"3002\" data-end=\"3036\"\u003edouble-sewn to the spider pack\u003c\/strong\u003e. Termination is available in \u003cstrong data-start=\"3066\" data-end=\"3110\"\u003estandard heavy-duty stitched hybrid lead\u003c\/strong\u003e or \u003cstrong data-start=\"3114\" data-end=\"3141\"\u003epush\/hybrid termination\u003c\/strong\u003e, depending on configuration. It also includes a \u003cstrong data-start=\"3190\" data-end=\"3213\"\u003ecarbon cap standard\u003c\/strong\u003e and a \u003cstrong data-start=\"3220\" data-end=\"3251\"\u003ehybrid stitched lead design\u003c\/strong\u003e for maximum current transfer.\u003c\/p\u003e\n\u003cp data-start=\"3283\" data-end=\"3469\"\u003eIf you are pairing a subwoofer like this with serious amplifier power, your electrical system matters too. Shop our \u003cstrong data-start=\"3399\" data-end=\"3413\"\u003eBig 3 Kits\u003c\/strong\u003e here:\u003cbr data-start=\"3419\" data-end=\"3422\"\u003e\u003ca data-start=\"3422\" data-end=\"3469\" 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=\"3471\" data-end=\"3672\"\u003eIf you are stepping into a larger high-output build, shop our \u003cstrong data-start=\"3533\" data-end=\"3556\"\u003eBrand X Alternators\u003c\/strong\u003e here:\u003cbr data-start=\"3562\" data-end=\"3565\"\u003e\u003ca data-start=\"3565\" data-end=\"3672\" 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=\"3674\" data-end=\"3870\"\u003eYou can also learn more about charging support for bigger systems in our \u003cstrong data-start=\"3747\" data-end=\"3778\"\u003ehigh output alternator blog\u003c\/strong\u003e here:\u003cbr data-start=\"3784\" data-end=\"3787\"\u003e\u003ca data-start=\"3787\" data-end=\"3870\" 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=\"3872\" data-end=\"4275\"\u003eBuilt with \u003cstrong data-start=\"3883\" data-end=\"3909\"\u003eU.S.-sourced materials\u003c\/strong\u003e, \u003cstrong data-start=\"3911\" data-end=\"3928\"\u003eCNC precision\u003c\/strong\u003e, and \u003cstrong data-start=\"3934\" data-end=\"3960\"\u003eSPL-proven motor force\u003c\/strong\u003e, the \u003cstrong data-start=\"3966\" data-end=\"3998\"\u003eRuthless Audio Quad Stack 15\u003c\/strong\u003e and \u003cstrong data-start=\"4003\" data-end=\"4035\"\u003eRuthless Audio Quad Stack 18\u003c\/strong\u003e are made for people who want strong low-end output without compromise. Whether you are building a hard-hitting daily driver or a serious SPL setup, the \u003cstrong data-start=\"4188\" data-end=\"4217\"\u003eRuthless Audio Quad Stack\u003c\/strong\u003e is built to deliver the kind of bass that gets attention.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv aria-hidden=\"true\" class=\"pointer-events-none -mt-px h-px translate-y-[calc(var(--scroll-root-safe-area-inset-bottom)-14*var(--spacing))]\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"Ruthless Audio","offers":[{"title":"D 0.7","offer_id":44492120653964,"sku":null,"price":749.95,"currency_code":"USD","in_stock":true},{"title":"D 1.7","offer_id":44492120686732,"sku":null,"price":749.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/5076\/8524\/files\/IMG_20250720_135006.webp?v=1757921755","url":"https:\/\/audiosellerz.com\/products\/ruthless-audio-15-3-coil-subwoofer-quad-stack-motor","provider":"Audio Sellerz","version":"1.0","type":"link"}