{"product_id":"mb-quart-mbqj-stg4a-1-800w-stage-4-jeep-jl-jt-car-audio-kit-oem-factory-radio","title":"MB Quart Stage 4 Audio System for Jeep Wrangler JL 18-23\/Gladiator JT 20-26 - 422642","description":"\u003ch2\u003eMB Quart Stage 4 Audio System for Jeep Wrangler JL 18-23\/Gladiator JT 20-26 - 422642\u003c\/h2\u003e\n\u003cp\u003eTake your Jeep’s sound system to the next level with the MB Quart MBQJ-STG4A-1 STAGE 4 Audio Upgrade Kit, engineered exclusively for Jeep Wrangler JL (2018-2023) and Gladiator JT (2020-2026). Designed to work with OEM factory radios and requiring a rear speaker kit or soundbar for complete coverage, this system delivers powerful, balanced, and precise sound performance on any road or trail.\u003c\/p\u003e\n\u003cp\u003eThis all-in-one kit comes with a premium 4-speaker set: two 3.5-inch coaxial speakers with 0.75-inch magnesium dome tweeters for crisp highs, and two 6.5-inch midbass drivers with polypropylene\/mica blend cones for strong midrange response. The system is driven by dual 400-watt NA2 Class-D compact amplifiers with on-board equalization, producing 800 watts of peak output in a high-efficiency, compact design. Optimized crossover networks (12dB midrange \/ 6dB tweeter) ensure every detail is tuned for clarity, depth, and full-range audio that cuts through road noise and outdoor conditions.\u003c\/p\u003e\n\u003cp\u003eBuilt for rugged environments, the MBQJ-STG4A-1 features durable composite mounting enclosures, a powder-coated amplifier plate, and high-quality speaker materials built to withstand demanding Jeep and truck use. Installation is quick and straightforward thanks to plug-and-play OEM harnesses and factory-specific mounting, eliminating the need for custom fabrication while ensuring a perfect fit.\u003c\/p\u003e\n\u003cp\u003eWith a frequency response of 75 Hz–23 kHz, sensitivity of 89 dB, and a sleek black finish that blends with Jeep interiors, this kit delivers both performance and style. Dimensions measure 22.24 x 18.34 x 10.59 inches with a total weight of 26 pounds. Backed by MB Quart’s heritage of German engineering, the STAGE 4 Jeep upgrade kit offers reliable power, premium sound quality, and long-lasting durability for your vehicle.\u003c\/p\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eStage 4 Audio system designed for OEM Source Unit engineered for Jeep Wrangler JL (2018-2023) and Gladiator JT (2020-2026) models\u003c\/li\u003e\n\u003cli\u003eUses OEM source unit, and requires rear speaker kit or soundbar\u003c\/li\u003e\n\u003cli\u003eIncludes (2) 3.5-inch coaxial speakers with 0.75-inch magnesium dome tweeters and (2) 6.5-inch midbass drivers with polypropylene\/mica blend cones\u003c\/li\u003e\n\u003cli\u003eIncludes dual 400-watt NA2 Class-D compact amplifiers engineered for high efficiency and reliable performance\u003c\/li\u003e\n\u003cli\u003eOn-board equalization provides balanced sound tuning with 800 watts total peak output\u003c\/li\u003e\n\u003cli\u003ePlug-and-play OEM harnesses and composite mounting enclosures for factory Jeep locations with no custom fabrication required\u003c\/li\u003e\n\u003cli\u003eOptimized crossover network (12dB midrange \/ 6dB tweeter) delivers clear highs, strong midrange detail and balanced full range sound\u003c\/li\u003e\n\u003cli\u003eRugged construction with high-quality cones, tweeters, and enclosures built to withstand demanding driving conditions\u003c\/li\u003e\n\u003cli\u003eWorks with OEM factory radios; requires rear speaker kit or soundbar for full coverage\u003c\/li\u003e\n\u003cli\u003eFrequency response: 75 Hz – 23 kHz\u003c\/li\u003e\n\u003cli\u003eSensitivity level: 89 dB\u003c\/li\u003e\n\u003cli\u003eMaterial: Metal, Plastic\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eDimensions (L x W x H): 22.24 x 18.34 x 10.59 inches\u003c\/li\u003e\n\u003cli\u003eWeight: 26 pounds\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eWhat our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"envwb8\" data-start=\"28\" data-end=\"280\"\u003e\n\u003cstrong data-start=\"30\" data-end=\"69\"\u003eComplete Jeep audio transformation:\u003c\/strong\u003e The MB Quart Stage 4 Audio System is engineered for \u003cstrong data-start=\"122\" data-end=\"186\" data-is-only-node=\"\"\u003e2018–2023 Jeep Wrangler JL and 2020–2026 Gladiator JT models\u003c\/strong\u003e, delivering a major upgrade over factory sound systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"rb99gj\" data-start=\"281\" data-end=\"519\"\u003e\n\u003cstrong data-start=\"283\" data-end=\"324\"\u003eHigh-performance speaker combination:\u003c\/strong\u003e Includes \u003cstrong data-start=\"334\" data-end=\"388\" data-is-only-node=\"\"\u003e3.5\" coaxial speakers with magnesium dome tweeters\u003c\/strong\u003e and \u003cstrong data-start=\"393\" data-end=\"417\"\u003e6.5\" midbass drivers\u003c\/strong\u003e for clearer highs, stronger vocals, and deeper midrange impact. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"jtjo4g\" data-start=\"520\" data-end=\"765\"\u003e\n\u003cstrong data-start=\"522\" data-end=\"558\"\u003ePowerful built-in amplification:\u003c\/strong\u003e Dual \u003cstrong data-start=\"564\" data-end=\"599\" data-is-only-node=\"\"\u003e400-watt NA2 Class-D amplifiers\u003c\/strong\u003e provide efficient power delivery with \u003cstrong data-start=\"638\" data-end=\"669\"\u003e800 watts total peak output\u003c\/strong\u003e for louder, cleaner audio in demanding Jeep environments. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1i9aqld\" data-start=\"766\" data-end=\"985\"\u003e\n\u003cstrong data-start=\"768\" data-end=\"795\"\u003ePrecision sound tuning:\u003c\/strong\u003e Integrated equalization and optimized crossover networks help create a balanced full-range listening experience with improved detail and sound staging. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"13uqc7i\" data-start=\"986\" data-end=\"1190\"\u003e\n\u003cstrong data-start=\"988\" data-end=\"1019\"\u003eJeep-friendly installation:\u003c\/strong\u003e Factory-style mounting enclosures and plug-and-play OEM harnesses allow a cleaner installation without extensive custom fabrication. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1q6unuf\" data-start=\"1191\" data-end=\"1403\"\u003e\n\u003cstrong data-start=\"1193\" data-end=\"1227\"\u003eBuilt for open-air adventures:\u003c\/strong\u003e Rugged components and durable construction help maintain strong performance during off-road driving, top-down cruising, and everyday use. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"zimhs\" data-start=\"1404\" data-end=\"1652\" data-is-last-node=\"\"\u003e\n\u003cstrong data-start=\"1406\" data-end=\"1432\"\u003eExpert recommendation:\u003c\/strong\u003e An ideal choice for Jeep owners seeking a \u003cstrong data-start=\"1475\" data-end=\"1613\" data-is-only-node=\"\"\u003epremium, high-output audio upgrade with factory-like fit, powerful amplification, and improved clarity on every trail or highway drive\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\n\u003cbr\u003eQ\u0026amp;A\u003c\/h5\u003e\n\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-WEB:9c66ce2e-eff1-429c-a7fb-40e13338efe5-17\" 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-WEB:9c66ce2e-eff1-429c-a7fb-40e13338efe5-17\" data-turn-id-container=\"request-WEB:9c66ce2e-eff1-429c-a7fb-40e13338efe5-17\" data-testid=\"conversation-turn-16\" 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=\"9f32ce6d-a118-42f6-8e8c-96fbd3bce012\" data-turn-start-message=\"true\" dir=\"auto\" data-message-model-slug=\"gpt-5-5-mini\" 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\" 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\u003cp data-start=\"144\" data-end=\"434\"\u003e\u003cstrong data-start=\"144\" data-end=\"200\"\u003eQ: What is the MB Quart 422642 Stage 4 Audio System?\u003c\/strong\u003e\u003cbr data-start=\"200\" data-end=\"203\"\u003e\u003cstrong data-start=\"203\" data-end=\"209\"\u003eA:\u003c\/strong\u003e It is a complete Jeep audio upgrade system designed to deliver powerful, high-quality sound for Jeep Wrangler JL and Gladiator JT models with improved clarity, bass response, and volume. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"436\" data-end=\"646\"\u003e\u003cstrong data-start=\"436\" data-end=\"501\"\u003eQ: Which Jeep models are compatible with this Stage 4 system?\u003c\/strong\u003e\u003cbr data-start=\"501\" data-end=\"504\"\u003e\u003cstrong data-start=\"504\" data-end=\"510\"\u003eA:\u003c\/strong\u003e It is designed for Jeep Wrangler JL models from 2018-2023 and Gladiator JT models from 2020-2026. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"648\" data-end=\"936\"\u003e\u003cstrong data-start=\"648\" data-end=\"711\"\u003eQ: What components are included in the MB Quart 422642 kit?\u003c\/strong\u003e\u003cbr data-start=\"711\" data-end=\"714\"\u003e\u003cstrong data-start=\"714\" data-end=\"720\"\u003eA:\u003c\/strong\u003e The system includes two 3.5-inch coaxial speakers with magnesium dome tweeters, two 6.5-inch midbass drivers, and dual 400-watt Class D amplifiers for powerful full-range audio. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"938\" data-end=\"1186\"\u003e\u003cstrong data-start=\"938\" data-end=\"998\"\u003eQ: How much power does the Stage 4 audio system produce?\u003c\/strong\u003e\u003cbr data-start=\"998\" data-end=\"1001\"\u003e\u003cstrong data-start=\"1001\" data-end=\"1007\"\u003eA:\u003c\/strong\u003e It delivers up to 800 watts of peak power through dual 400-watt NA2 Class D amplifiers with onboard equalization for optimized sound tuning. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1188\" data-end=\"1442\"\u003e\u003cstrong data-start=\"1188\" data-end=\"1245\"\u003eQ: Does this system work with the factory Jeep radio?\u003c\/strong\u003e\u003cbr data-start=\"1245\" data-end=\"1248\"\u003e\u003cstrong data-start=\"1248\" data-end=\"1254\"\u003eA:\u003c\/strong\u003e Yes. The 422642 version is designed for use with the OEM factory source unit and requires a rear speaker kit or soundbar for complete audio coverage. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1444\" data-end=\"1740\"\u003e\u003cstrong data-start=\"1444\" data-end=\"1504\"\u003eQ: Will this upgrade improve factory Jeep sound quality?\u003c\/strong\u003e\u003cbr data-start=\"1504\" data-end=\"1507\"\u003e\u003cstrong data-start=\"1507\" data-end=\"1513\"\u003eA:\u003c\/strong\u003e Yes. The tuned crossover network, upgraded speakers, and dedicated amplifiers provide clearer highs, stronger mids, deeper bass, and better performance in open-air Jeep driving conditions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1742\" data-end=\"1976\"\u003e\u003cstrong data-start=\"1742\" data-end=\"1779\"\u003eQ: Is installation plug-and-play?\u003c\/strong\u003e\u003cbr data-start=\"1779\" data-end=\"1782\"\u003e\u003cstrong data-start=\"1782\" data-end=\"1788\"\u003eA:\u003c\/strong\u003e Yes. The system includes OEM-style harnesses and vehicle-specific mounting enclosures designed for factory Jeep locations without custom fabrication. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1978\" data-end=\"2252\"\u003e\u003cstrong data-start=\"1978\" data-end=\"2039\"\u003eQ: What makes this system suitable for Jeep off-road use?\u003c\/strong\u003e\u003cbr data-start=\"2039\" data-end=\"2042\"\u003e\u003cstrong data-start=\"2042\" data-end=\"2048\"\u003eA:\u003c\/strong\u003e The rugged speaker materials, durable enclosures, and efficient Class D amplifiers are designed to handle demanding Jeep environments and outdoor driving conditions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2254\" data-end=\"2454\"\u003e\u003cstrong data-start=\"2254\" data-end=\"2299\"\u003eQ: Does this kit include a rear soundbar?\u003c\/strong\u003e\u003cbr data-start=\"2299\" data-end=\"2302\"\u003e\u003cstrong data-start=\"2302\" data-end=\"2308\"\u003eA:\u003c\/strong\u003e No. A compatible rear speaker kit or soundbar is required separately to complete the full Jeep audio setup. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2456\" data-end=\"2699\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"2456\" data-end=\"2525\"\u003eQ: What is the frequency response of the MB Quart Stage 4 system?\u003c\/strong\u003e\u003cbr data-start=\"2525\" data-end=\"2528\"\u003e\u003cstrong data-start=\"2528\" data-end=\"2534\"\u003eA:\u003c\/strong\u003e The system provides a wide 75Hz–23kHz frequency response with 89dB sensitivity for balanced and detailed audio reproduction. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\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\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch5\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-WEB:eb2a1300-eec4-44d0-803a-001c483cee01-18\" 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-WEB:eb2a1300-eec4-44d0-803a-001c483cee01-18\" data-turn-id-container=\"request-WEB:eb2a1300-eec4-44d0-803a-001c483cee01-18\" data-testid=\"conversation-turn-16\" 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=\"5e203c5d-0fb9-4330-97c0-3696840145a3\" dir=\"auto\" data-message-model-slug=\"gpt-5-5-mini\" 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=\"121\" data-end=\"1071\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"xdqsj1\" data-start=\"121\" data-end=\"222\"\u003eClean speakers, soundbar, and audio components regularly to remove dust, dirt, and off-road debris.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1w8cqdn\" data-start=\"223\" data-end=\"321\"\u003eProtect audio components from excessive water exposure during open-top driving or harsh weather.\u003c\/li\u003e\n\u003cli data-section-id=\"6d0f8i\" data-start=\"322\" data-end=\"419\"\u003eInspect all wiring, connectors, and terminals periodically for corrosion, looseness, or damage.\u003c\/li\u003e\n\u003cli data-section-id=\"7gqllg\" data-start=\"420\" data-end=\"521\"\u003eCheck amplifier settings and connections to maintain proper sound performance and prevent overload.\u003c\/li\u003e\n\u003cli data-section-id=\"1x80o46\" data-start=\"522\" data-end=\"608\"\u003eAvoid extended playback at maximum volume to reduce distortion and protect speakers.\u003c\/li\u003e\n\u003cli data-section-id=\"m83f11\" data-start=\"609\" data-end=\"695\"\u003eUse balanced EQ and gain settings to maintain clear audio and extend component life.\u003c\/li\u003e\n\u003cli data-section-id=\"8m259u\" data-start=\"696\" data-end=\"791\"\u003eSecurely check mounting hardware after off-road trips to prevent vibration-related loosening.\u003c\/li\u003e\n\u003cli data-section-id=\"65jthd\" data-start=\"792\" data-end=\"875\"\u003eClean surfaces with a soft cloth and avoid harsh chemicals or abrasive materials.\u003c\/li\u003e\n\u003cli data-section-id=\"y2ebk1\" data-start=\"876\" data-end=\"975\"\u003eMonitor for unusual sounds such as buzzing, rattling, or reduced output and address issues early.\u003c\/li\u003e\n\u003cli data-section-id=\"1ygxufd\" data-start=\"976\" data-end=\"1071\" data-is-last-node=\"\"\u003eKeep the Jeep interior and audio enclosures clean and dry for reliable long-term 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\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"MB Quart","offers":[{"title":"Default Title","offer_id":45829143691455,"sku":"422642","price":930.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/422642_main.jpg?v=1783516526","url":"https:\/\/www.mybackyardzone.com\/products\/mb-quart-mbqj-stg4a-1-800w-stage-4-jeep-jl-jt-car-audio-kit-oem-factory-radio","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}