{"product_id":"sky-high-car-audio-fmx-18-subwoofer-3500w-rms-d1-d2","title":"Sundown Audio Sky High Car Audio FMX Series 18\" Subwoofer – 3500W RMS D1\/D2 - SHCA-FMX-18-D1","description":"\u003ch2 data-start=\"106\" data-end=\"214\"\u003eSundown Audio Sky High Car Audio FMX Series 18\" Subwoofer – 3500W RMS D1\/D2 - SHCA-FMX-18-D1\u003c\/h2\u003e\n\u003cp data-start=\"106\" data-end=\"214\"\u003eSky High Car Audio FMX Series 18\" Subwoofer – 3500W RMS D1\/D2\u003cbr data-start=\"185\" data-end=\"188\"\u003eSold by AudioSellerz.com\u003c\/p\u003e\n\u003cp data-start=\"216\" data-end=\"617\"\u003eThe \u003cstrong data-start=\"220\" data-end=\"267\"\u003eSky High Car Audio FMX Series 18\" Subwoofer\u003c\/strong\u003e is built for serious low-end junkies—big cone area, huge motor, and true high-power handling for walls, blow-throughs, and brutal demo systems. As part of the \u003cstrong data-start=\"427\" data-end=\"472\"\u003eFMX “Forged to Perform. Built to Endure.”\u003c\/strong\u003e lineup (up to 3500W RMS), the 18 inch model brings maximum surface area and excursion to the table for deep, violent bass in large enclosures.\u003c\/p\u003e\n\u003cp data-start=\"619\" data-end=\"1045\"\u003eFMX was engineered from real-world abuse in loud daily and competition vehicles—not just spec sheet flex. The FMX 18 uses an overbuilt motor structure, high-temperature coil, and heavy-duty suspension to survive high clamp power and long demo sessions when you support it with the right electrical and enclosure design. This is the 18\" you choose when you want show-level output that can still live in a daily-driven system.\u003c\/p\u003e\n\u003cp data-start=\"1047\" data-end=\"1314\"\u003eAvailable in \u003cstrong data-start=\"1060\" data-end=\"1079\"\u003edual 1 ohm (D1)\u003c\/strong\u003e and \u003cstrong data-start=\"1084\" data-end=\"1103\"\u003edual 2 ohm (D2)\u003c\/strong\u003e voice coil options, the \u003cstrong data-start=\"1128\" data-end=\"1146\"\u003eFMX Series 18\"\u003c\/strong\u003e gives you flexible wiring choices for big Korean or Brazilian monoblocks, whether you’re running a single monster sub or multiple 18s in a wall or big SUV\/van build.\u003c\/p\u003e\n\u003ch5 data-start=\"1316\" data-end=\"1373\"\u003e\u003cstrong data-start=\"1316\" data-end=\"1371\"\u003eFeatures \u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul data-start=\"1374\" data-end=\"2504\"\u003e\n\u003cli data-start=\"1374\" data-end=\"1433\"\u003e\n\u003cp data-start=\"1376\" data-end=\"1433\"\u003e\u003cstrong data-start=\"1376\" data-end=\"1385\"\u003eSize:\u003c\/strong\u003e 18 inch FMX Series high-performance subwoofer\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1434\" data-end=\"1583\"\u003e\n\u003cp data-start=\"1436\" data-end=\"1583\"\u003e\u003cstrong data-start=\"1436\" data-end=\"1456\"\u003eRMS Power Class:\u003c\/strong\u003e Up to \u003cstrong data-start=\"1463\" data-end=\"1476\"\u003e3500W RMS\u003c\/strong\u003e (FMX family design and construction, built for high-power musical use when properly installed and tuned)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1584\" data-end=\"1645\"\u003e\n\u003cp data-start=\"1586\" data-end=\"1645\"\u003e\u003cstrong data-start=\"1586\" data-end=\"1597\"\u003eSeries:\u003c\/strong\u003e \u003cstrong data-start=\"1598\" data-end=\"1643\"\u003eFMX – Forged to Perform. Built to Endure.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1646\" data-end=\"1723\"\u003e\n\u003cp data-start=\"1648\" data-end=\"1679\"\u003e\u003cstrong data-start=\"1648\" data-end=\"1677\"\u003eVoice Coil Configuration:\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1682\" data-end=\"1701\"\u003e\n\u003cp data-start=\"1684\" data-end=\"1701\"\u003eDual 1 ohm (D1)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1704\" data-end=\"1723\"\u003e\n\u003cp data-start=\"1706\" data-end=\"1723\"\u003eDual 2 ohm (D2)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1724\" data-end=\"1868\"\u003e\n\u003cp data-start=\"1726\" data-end=\"1868\"\u003e\u003cstrong data-start=\"1726\" data-end=\"1743\"\u003eMotor Design:\u003c\/strong\u003e Overbuilt high-power motor engineered for strong motor force, high thermal capacity, and long-term reliability under abuse\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1869\" data-end=\"1992\"\u003e\n\u003cp data-start=\"1871\" data-end=\"1992\"\u003e\u003cstrong data-start=\"1871\" data-end=\"1893\"\u003eSuspension System:\u003c\/strong\u003e Heavy-duty surround and spider pack designed for high excursion and control at high power levels\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1993\" data-end=\"2214\"\u003e\n\u003cp data-start=\"1995\" data-end=\"2019\"\u003e\u003cstrong data-start=\"1995\" data-end=\"2017\"\u003ePerformance Focus:\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2022\" data-end=\"2073\"\u003e\n\u003cp data-start=\"2024\" data-end=\"2073\"\u003eMassive low-frequency output with deep response\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2076\" data-end=\"2131\"\u003e\n\u003cp data-start=\"2078\" data-end=\"2131\"\u003eStable performance on big power for demos and shows\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2134\" data-end=\"2214\"\u003e\n\u003cp data-start=\"2136\" data-end=\"2214\"\u003eReliability when paired with proper electrical upgrades and enclosure design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2215\" data-end=\"2504\"\u003e\n\u003cp data-start=\"2217\" data-end=\"2243\"\u003e\u003cstrong data-start=\"2217\" data-end=\"2241\"\u003eIdeal Install Types:\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2246\" data-end=\"2320\"\u003e\n\u003cp data-start=\"2248\" data-end=\"2320\"\u003eLarge \u003cstrong data-start=\"2254\" data-end=\"2279\"\u003eported 18\" enclosures\u003c\/strong\u003e in SUVs, vans, and blow-through builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2323\" data-end=\"2359\"\u003e\n\u003cp data-start=\"2325\" data-end=\"2359\"\u003e4th and 6th order bandpass walls\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2362\" data-end=\"2426\"\u003e\n\u003cp data-start=\"2364\" data-end=\"2426\"\u003eMulti-18 setups for demo rigs and competition-leaning builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2429\" data-end=\"2504\"\u003e\n\u003cp data-start=\"2431\" data-end=\"2504\"\u003eHigh-output daily systems where you want true “big boy” 18\" performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eWhat Our Experts Think\u003c\/h5\u003e\n\u003cdiv class=\"text-base my-auto mx-auto [--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\" data-conversation-screenshot-content=\"\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv 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-message-model-slug=\"gpt-5-5\" dir=\"auto\" data-message-id=\"1a388ce2-7ffe-487f-8a43-90135dbb352b\" data-message-author-role=\"assistant\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cul data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"930\" data-start=\"28\"\u003e\n\u003cli data-end=\"169\" data-start=\"28\" data-section-id=\"pvvct2\"\u003e\n\u003cstrong data-end=\"66\" data-start=\"30\"\u003eDesigned for Dual Zv4 Subwoofers\u003c\/strong\u003e – Engineered specifically to maximize the performance of \u003cstrong data-is-only-node=\"\" data-end=\"157\" data-start=\"124\"\u003etwo 12-inch Sundown Audio Zv4\u003c\/strong\u003e subwoofers.\u003c\/li\u003e\n\u003cli data-end=\"330\" data-start=\"170\" data-section-id=\"1w9806v\"\u003e\n\u003cstrong data-end=\"204\" data-start=\"172\"\u003eExtreme Output Ported Design\u003c\/strong\u003e – Delivers deep bass extension, exceptional efficiency, and powerful low-frequency impact for high-performance audio systems.\u003c\/li\u003e\n\u003cli data-end=\"482\" data-start=\"331\" data-section-id=\"1mcqe1o\"\u003e\n\u003cstrong data-end=\"376\" data-start=\"333\"\u003ePrecision-Tuned for Maximum Performance\u003c\/strong\u003e – Optimized internal airspace and port configuration help extract the full potential of the Zv4 platform.\u003c\/li\u003e\n\u003cli data-end=\"627\" data-start=\"483\" data-section-id=\"1qpslg9\"\u003e\n\u003cstrong data-end=\"521\" data-start=\"485\"\u003eBuilt for Serious Power Handling\u003c\/strong\u003e – Designed to support the high-excursion capabilities and demanding power requirements of the Zv4 series.\u003c\/li\u003e\n\u003cli data-end=\"761\" data-start=\"628\" data-section-id=\"ntlyg2\"\u003e\n\u003cstrong data-end=\"657\" data-start=\"630\"\u003eHeavy-Duty Construction\u003c\/strong\u003e – Reinforced enclosure design minimizes flex and unwanted resonance for cleaner, tighter bass response.\u003c\/li\u003e\n\u003cli data-is-last-node=\"\" data-end=\"930\" data-start=\"762\" data-section-id=\"18dhdk0\"\u003e\n\u003cstrong data-end=\"801\" data-start=\"764\"\u003eExpert Choice for SPL Enthusiasts\u003c\/strong\u003e – Ideal for users seeking competition-level output, deep low-end authority, and professionally engineered enclosure performance.\u003c\/li\u003e\n\u003c\/ul\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\u003ch5\u003eQ\u0026amp;A\u003c\/h5\u003e\n\u003cp data-start=\"0\" data-end=\"232\"\u003e\u003cstrong data-start=\"0\" data-end=\"90\"\u003eQ: What is the Sundown Audio Sky High Car Audio FMX Series 18\" Subwoofer designed for?\u003c\/strong\u003e\u003cbr data-start=\"90\" data-end=\"93\"\u003eA: It is a high-performance 18-inch subwoofer built for extreme bass output, deep low-frequency response, and high-power car audio systems.\u003c\/p\u003e\n\u003cp data-start=\"234\" data-end=\"398\"\u003e\u003cstrong data-start=\"234\" data-end=\"286\"\u003eQ: How much power can the FMX Series 18\" handle?\u003c\/strong\u003e\u003cbr data-start=\"286\" data-end=\"289\"\u003eA: It is rated to handle up to \u003cstrong data-start=\"320\" data-end=\"339\"\u003e3,500 watts RMS\u003c\/strong\u003e, making it suitable for demanding high-power applications.\u003c\/p\u003e\n\u003cp data-start=\"400\" data-end=\"586\"\u003e\u003cstrong data-start=\"400\" data-end=\"454\"\u003eQ: What does the D1 voice coil configuration mean?\u003c\/strong\u003e\u003cbr data-start=\"454\" data-end=\"457\"\u003eA: D1 indicates a dual 1-ohm voice coil design, providing flexible wiring options for amplifier matching and system optimization.\u003c\/p\u003e\n\u003cp data-start=\"588\" data-end=\"785\"\u003e\u003cstrong data-start=\"588\" data-end=\"638\"\u003eQ: What type of bass performance can I expect?\u003c\/strong\u003e\u003cbr data-start=\"638\" data-end=\"641\"\u003eA: Expect powerful low-end output, deep bass extension, and impressive SPL capability for both daily listening and competition-oriented systems.\u003c\/p\u003e\n\u003cp data-start=\"787\" data-end=\"973\"\u003e\u003cstrong data-start=\"787\" data-end=\"843\"\u003eQ: Is this subwoofer suitable for ported enclosures?\u003c\/strong\u003e\u003cbr data-start=\"843\" data-end=\"846\"\u003eA: Yes, it performs exceptionally well in properly designed ported enclosures that maximize output and low-frequency extension.\u003c\/p\u003e\n\u003cp data-start=\"975\" data-end=\"1138\"\u003e\u003cstrong data-start=\"975\" data-end=\"1024\"\u003eQ: What makes an 18-inch subwoofer different?\u003c\/strong\u003e\u003cbr data-start=\"1024\" data-end=\"1027\"\u003eA: The larger cone area moves more air, producing deeper bass and higher output levels than smaller subwoofers.\u003c\/p\u003e\n\u003cp data-start=\"1140\" data-end=\"1312\"\u003e\u003cstrong data-start=\"1140\" data-end=\"1189\"\u003eQ: Is this subwoofer suitable for SPL builds?\u003c\/strong\u003e\u003cbr data-start=\"1189\" data-end=\"1192\"\u003eA: Yes, its high RMS rating and robust design make it an excellent choice for SPL-focused and high-output audio systems.\u003c\/p\u003e\n\u003cp data-start=\"1314\" data-end=\"1484\"\u003e\u003cstrong data-start=\"1314\" data-end=\"1356\"\u003eQ: What amplifier size is recommended?\u003c\/strong\u003e\u003cbr data-start=\"1356\" data-end=\"1359\"\u003eA: For best performance, pair it with a quality amplifier capable of delivering power within the subwoofer's rated RMS range.\u003c\/p\u003e\n\u003cp data-start=\"1486\" data-end=\"1680\"\u003e\u003cstrong data-start=\"1486\" data-end=\"1548\"\u003eQ: Does this subwoofer require a strong electrical system?\u003c\/strong\u003e\u003cbr data-start=\"1548\" data-end=\"1551\"\u003eA: Yes, high-power subwoofers often benefit from upgraded batteries, wiring, and charging systems to support their power demands.\u003c\/p\u003e\n\u003cp data-start=\"1682\" data-end=\"1856\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1682\" data-end=\"1730\"\u003eQ: Is professional installation recommended?\u003c\/strong\u003e\u003cbr data-start=\"1730\" data-end=\"1733\"\u003eA: Yes, professional installation and tuning are recommended to ensure optimal performance, reliability, and system safety.\u003c\/p\u003e\n\u003ch5\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a2823de-bb48-83e8-bd21-1f08e49c2afd-2\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto 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-6a2823de-bb48-83e8-bd21-1f08e49c2afd-2\" data-turn-id-container=\"request-6a2823de-bb48-83e8-bd21-1f08e49c2afd-2\" data-testid=\"conversation-turn-100\" 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 data-conversation-screenshot-content=\"\" 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=\"3fb005b6-2330-43b3-9c23-623cf03e7a0a\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" 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 wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cul data-start=\"22\" data-end=\"748\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"1cu6lhk\" data-start=\"22\" data-end=\"116\"\u003eEnsure the subwoofer is powered within its rated RMS range to prevent overheating or damage.\u003c\/li\u003e\n\u003cli data-section-id=\"1aspf3z\" data-start=\"117\" data-end=\"220\"\u003ePeriodically inspect speaker terminals and wiring connections for corrosion, wear, or loose contacts.\u003c\/li\u003e\n\u003cli data-section-id=\"1g4frci\" data-start=\"221\" data-end=\"295\"\u003eCheck mounting screws regularly to keep the subwoofer securely fastened.\u003c\/li\u003e\n\u003cli data-section-id=\"xn8wbp\" data-start=\"296\" data-end=\"369\"\u003eKeep the cone, surround, and dust cap free from dust, dirt, and debris.\u003c\/li\u003e\n\u003cli data-section-id=\"7a59m3\" data-start=\"370\" data-end=\"466\"\u003eAvoid excessive clipping or distorted amplifier signals, which can shorten subwoofer lifespan.\u003c\/li\u003e\n\u003cli data-section-id=\"1mi0h2v\" data-start=\"467\" data-end=\"548\"\u003eProtect the subwoofer from moisture, extreme temperatures, and direct sunlight.\u003c\/li\u003e\n\u003cli data-section-id=\"1oexnhe\" data-start=\"549\" data-end=\"645\"\u003eInspect the enclosure for air leaks or damage that could affect sound quality and performance.\u003c\/li\u003e\n\u003cli data-section-id=\"18e3o0\" data-start=\"646\" data-end=\"748\" data-is-last-node=\"\"\u003eListen for unusual noises or distortion and address issues promptly to maintain optimal bass output.\u003c\/li\u003e\n\u003c\/ul\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\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sundown Audio","offers":[{"title":"D1","offer_id":45711592816831,"sku":"SHCA-FMX-18-D1","price":596.99,"currency_code":"USD","in_stock":true},{"title":"D2","offer_id":45711592849599,"sku":"SHCA-FMX-18-D2","price":596.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/11151F31-694F-45CC-A192-FB29A9BBD117.png?v=1781265858","url":"https:\/\/www.mybackyardzone.com\/products\/sky-high-car-audio-fmx-18-subwoofer-3500w-rms-d1-d2","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}