{"product_id":"ruthless-audio-15-3-coil-subwoofer-quad-stack-motor-copy","title":"Ruthless Audio 18\" 3\" Coil Subwoofer Quad Stack Motor","description":"\u003cp data-start=\"0\" data-end=\"88\"\u003e\u003cstrong data-start=\"0\" data-end=\"61\"\u003eRuthless Audio Quad Stack Subwoofer 15\" and 18\" 2500W RMS\u003c\/strong\u003e\u003cbr data-start=\"61\" data-end=\"64\"\u003eSold by AudioSellerz.com\u003c\/p\u003e\n\u003cp data-start=\"90\" data-end=\"618\"\u003eIf you are building a serious bass setup and need a subwoofer that can handle real abuse, the \u003cstrong data-start=\"184\" data-end=\"213\"\u003eRuthless Audio Quad Stack\u003c\/strong\u003e is built for exactly that kind of system. Available in \u003cstrong data-start=\"269\" data-end=\"284\"\u003e15\" and 18\"\u003c\/strong\u003e sizes and rated at \u003cstrong data-start=\"304\" data-end=\"322\"\u003e2500 watts RMS\u003c\/strong\u003e, the \u003cstrong data-start=\"328\" data-end=\"361\"\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 makes sense in SPL-focused builds. Shop more \u003cstrong data-start=\"514\" data-end=\"558\"\u003eRuthless Audio subwoofers and amplifiers\u003c\/strong\u003e here:\u003cbr data-start=\"564\" data-end=\"567\"\u003e\u003ca data-start=\"567\" data-end=\"618\" 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=\"620\" data-end=\"1012\"\u003eThe \u003cstrong data-start=\"624\" data-end=\"650\"\u003eRuthless Quad Stack 15\u003c\/strong\u003e and \u003cstrong data-start=\"655\" data-end=\"681\"\u003eRuthless Quad Stack 18\u003c\/strong\u003e were built from the ground up for people who want real motor force, reliable cooling, and serious low-end output. Using \u003cstrong data-start=\"802\" data-end=\"816\"\u003eU.S. steel\u003c\/strong\u003e, \u003cstrong data-start=\"818\" data-end=\"845\"\u003eCNC precision machining\u003c\/strong\u003e, and an \u003cstrong data-start=\"854\" data-end=\"884\"\u003eFEA-optimized motor design\u003c\/strong\u003e, this subwoofer is made to deliver the kind of bass that works in both hard-hitting daily setups and competition-style systems.\u003c\/p\u003e\n\u003cp data-start=\"1014\" data-end=\"1426\"\u003eRated at \u003cstrong data-start=\"1023\" data-end=\"1041\"\u003e2500 watts RMS\u003c\/strong\u003e, the \u003cstrong data-start=\"1047\" data-end=\"1076\"\u003eRuthless Audio Quad Stack\u003c\/strong\u003e is available in \u003cstrong data-start=\"1093\" data-end=\"1109\"\u003edual 0.7 ohm\u003c\/strong\u003e and \u003cstrong data-start=\"1114\" data-end=\"1130\"\u003edual 1.7 ohm\u003c\/strong\u003e options, giving you flexibility when matching the subwoofer to your amplifier and final system impedance. If you need help figuring out the right final ohm load, read our \u003cstrong data-start=\"1302\" data-end=\"1336\"\u003ecar audio wiring diagram guide\u003c\/strong\u003e here:\u003cbr data-start=\"1342\" data-end=\"1345\"\u003e\u003ca data-start=\"1345\" data-end=\"1426\" 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=\"1428\" data-end=\"1814\"\u003eA big part of what makes the \u003cstrong data-start=\"1457\" data-end=\"1490\"\u003eRuthless Quad Stack subwoofer\u003c\/strong\u003e stand out is the motor structure. It uses \u003cstrong data-start=\"1533\" data-end=\"1563\"\u003equad stack ferrite magnets\u003c\/strong\u003e cut on a water jet and finish-machined in-house to deliver serious motor force and strong control under load. That gives the \u003cstrong data-start=\"1689\" data-end=\"1730\"\u003eRuthless Audio Quad Stack 15\" and 18\"\u003c\/strong\u003e the kind of foundation needed for aggressive bass and real low-frequency authority.\u003c\/p\u003e\n\u003cp data-start=\"1816\" data-end=\"2123\"\u003eThis subwoofer also uses a \u003cstrong data-start=\"1843\" data-end=\"1886\"\u003esolid pole with staged aluminum cooling\u003c\/strong\u003e to help manage heat during long play time and heavy abuse. Combined with a \u003cstrong data-start=\"1962\" data-end=\"1996\"\u003e3\" diameter 4-layer voice coil\u003c\/strong\u003e and \u003cstrong data-start=\"2001\" data-end=\"2026\"\u003e5 progressive spiders\u003c\/strong\u003e, the \u003cstrong data-start=\"2032\" data-end=\"2055\"\u003eRuthless Quad Stack\u003c\/strong\u003e is built to stay more stable and controlled when power levels rise.\u003c\/p\u003e\n\u003cp data-start=\"2125\" data-end=\"2534\"\u003eThe rest of the design follows through with serious hardware. A \u003cstrong data-start=\"2189\" data-end=\"2225\"\u003ekraft pulp fiber reinforced cone\u003c\/strong\u003e, \u003cstrong data-start=\"2227\" data-end=\"2260\"\u003edual-layer wide foam surround\u003c\/strong\u003e, \u003cstrong data-start=\"2262\" data-end=\"2298\"\u003eextra heavy-duty aluminum basket\u003c\/strong\u003e, and \u003cstrong data-start=\"2304\" data-end=\"2326\"\u003ewrap-around gasket\u003c\/strong\u003e all help support the kind of mechanical strength a high-output subwoofer needs. The \u003cstrong data-start=\"2411\" data-end=\"2425\"\u003ecarbon cap\u003c\/strong\u003e comes standard, and the \u003cstrong data-start=\"2450\" data-end=\"2481\"\u003ehybrid stitched lead design\u003c\/strong\u003e helps improve current transfer in demanding systems.\u003c\/p\u003e\n\u003cp data-start=\"2536\" data-end=\"2871\"\u003eThe \u003cstrong data-start=\"2540\" data-end=\"2579\"\u003eRuthless Audio Quad Stack subwoofer\u003c\/strong\u003e also uses \u003cstrong data-start=\"2590\" data-end=\"2616\"\u003e144-count tinsel leads\u003c\/strong\u003e that are double-sewn to the spider pack, with \u003cstrong data-start=\"2663\" data-end=\"2725\"\u003eheavy-duty stitched hybrid lead or push\/hybrid termination\u003c\/strong\u003e depending on configuration. This is the kind of build that makes sense for people who want a subwoofer that can take real power and keep working.\u003c\/p\u003e\n\u003cp data-start=\"2873\" data-end=\"3059\"\u003eIf you are pairing a subwoofer like this with serious amplifier power, your electrical system matters too. Shop our \u003cstrong data-start=\"2989\" data-end=\"3003\"\u003eBig 3 Kits\u003c\/strong\u003e here:\u003cbr data-start=\"3009\" data-end=\"3012\"\u003e\u003ca data-start=\"3012\" data-end=\"3059\" 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=\"3061\" data-end=\"3262\"\u003eIf you are stepping into a larger high-output build, shop our \u003cstrong data-start=\"3123\" data-end=\"3146\"\u003eBrand X Alternators\u003c\/strong\u003e here:\u003cbr data-start=\"3152\" data-end=\"3155\"\u003e\u003ca data-start=\"3155\" data-end=\"3262\" 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=\"3264\" data-end=\"3460\"\u003eYou can also learn more about charging support for bigger systems in our \u003cstrong data-start=\"3337\" data-end=\"3368\"\u003ehigh output alternator blog\u003c\/strong\u003e here:\u003cbr data-start=\"3374\" data-end=\"3377\"\u003e\u003ca data-start=\"3377\" data-end=\"3460\" 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=\"3462\" data-end=\"3844\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eBuilt with U.S.-sourced materials, CNC precision, and SPL-proven design, the \u003cstrong data-start=\"3539\" data-end=\"3571\"\u003eRuthless Audio Quad Stack 15\u003c\/strong\u003e and \u003cstrong data-start=\"3576\" data-end=\"3608\"\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 daily driver that hits hard or a serious SPL setup, the \u003cstrong data-start=\"3763\" data-end=\"3786\"\u003eRuthless Quad Stack\u003c\/strong\u003e is built to deliver the kind of bass that gets attention.\u003c\/p\u003e","brand":"Ruthless Audio","offers":[{"title":"D 0.7","offer_id":44492120719500,"sku":null,"price":799.95,"currency_code":"USD","in_stock":true},{"title":"D 1.7","offer_id":44492120752268,"sku":null,"price":799.95,"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-copy","provider":"Audio Sellerz","version":"1.0","type":"link"}