{"product_id":"jensen-ja4ch-class-d-4-channel-car-audio-amplifier-compact-power","title":"JENSEN JA4CH Class-D 4-Channel Car Audio Amplifier - Compact Power","description":"\u003cp\u003eIn this review of the JENSEN JA4CH, the bottom line is straightforward: it's a compact, efficient \u003cstrong\u003eClass-D 4-channel amplifier\u003c\/strong\u003e aimed at riders and small-vehicle owners who need reliable power without bulk. The JA4CH delivers a flexible feature set - bridgable channels, selectable crossovers, and both high and low level inputs - making it a sensible upgrade for motorcycles, ATVs, UTVs and golf carts where space and thermal management matter. For anyone building a multi-speaker system or a bridged subwoofer channel in a tight space, this amp balances power and efficiency well.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass-D efficiency:\u003c\/strong\u003e Delivers up to 1,000 Watts peak while keeping size and heat generation low for compact installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBridgable channels:\u003c\/strong\u003e Can be run as 4-channel stereo or bridged to two channels for higher subwoofer output without a separate mono amp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible inputs:\u003c\/strong\u003e Accepts both low level RCA and high level speaker inputs to work with factory or aftermarket head units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelectable crossovers:\u003c\/strong\u003e Built-in high pass and low pass crossovers let you tailor speaker and subwoofer roll-offs for cleaner sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBass boost and adjustable LPF:\u003c\/strong\u003e Variable bass boost (noted at 45Hz and 50Hz adjustment) and a low pass crossover provide extra punch for small enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety protection:\u003c\/strong\u003e Thermal and short circuit protection help safeguard the unit and connected speakers during heavy use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis amp is best for people installing audio in constrained environments: motorcycle fairings, UTV racks, golf cart enclosures, or compact car installs where a full-size amp would not fit. Installers who need both stereo channel driving and the option to bridge for a sub will appreciate the flexibility.\u003c\/p\u003e\u003cp\u003eThose who want high-end audiophile refinement or multi-kilowatt systems should look elsewhere; the JA4CH is tuned for practical, efficient power delivery and convenience rather than studio-grade fidelity or massive output for large vehicles.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompact \u003cstrong\u003eClass-D\u003c\/strong\u003e design provides strong power-to-size ratio suitable for small vehicles.\u003c\/li\u003e\n\u003cli\u003eMultiple input options and pass-thru RCAs make integration with existing systems straightforward.\u003c\/li\u003e\n\u003cli\u003eBuilt-in crossovers and adjustable bass boost allow quick tuning without extra processors.\u003c\/li\u003e\n\u003cli\u003eBuilt-in protection reduces risk during demanding use in confined installations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot intended for large-scale, high-fidelity builds; it's optimized for efficiency and practical use rather than audiophile detail.\u003c\/li\u003e\n\u003cli\u003eManual controls may require tuning time during installation to get optimal crossover and bass settings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eClass-D 4-channel amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Power\u003c\/td\u003e\n\u003ctd\u003e1,000 Watts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRMS Power\u003c\/td\u003e\n\u003ctd\u003e80W x 4 @ 4 ohms; 120W x 2 @ 2 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBridged Power\u003c\/td\u003e\n\u003ctd\u003e240W x 2 @ 4 ohms (bridged)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrossovers\u003c\/td\u003e\n\u003ctd\u003eSelectable high pass, low pass, full range; variable LPF and bass boost\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eLow level (RCA) and high level (speaker wire)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eShort circuit and thermal\/DC offset safety protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe JENSEN JA4CH is a practical, value-oriented amplifier for riders and small-vehicle owners who need a compact, versatile power solution. Its \u003cstrong\u003ebridgable\u003c\/strong\u003e channels, selectable crossovers and dual input options make installation flexible, and the Class-D design keeps heat and size down. For anyone building a modest multi-channel system or adding a bridged sub in tight spaces, it offers good performance for the price.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan this amp be bridged for a subwoofer?\u003c\/strong\u003e\u003cbr\u003eYes. The JA4CH supports bridging to produce 240W x 2 at 4 ohms for higher sub output.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat input options are available?\u003c\/strong\u003e\u003cbr\u003eIt offers both low level RCA inputs and high level speaker wire inputs, plus RCA pass-thru outputs for chaining.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there protection against overheating or shorts?\u003c\/strong\u003e\u003cbr\u003eYes. The amplifier includes thermal and short circuit protection and DC offset safety features.\u003c\/p\u003e","brand":"Jensen","offers":[{"title":"Default Title","offer_id":48654111572187,"sku":"B0DMTXBQYW","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81Ibwh-Bp6L._SL1500.jpg?v=1778655501","url":"https:\/\/gearmusthave.com\/products\/jensen-ja4ch-class-d-4-channel-car-audio-amplifier-compact-power","provider":"GearMustHave","version":"1.0","type":"link"}