{"product_id":"alliance-audio-vl20004-4-channel-class-d-amplifier","title":"Alliance Audio VL20004 4-Channel Class D Amplifier","description":"\u003cp\u003eThe \u003cstrong\u003eAlliance Audio VL20004\u003c\/strong\u003e is a compact, high-efficiency \u003cstrong\u003e4-channel Class D amplifier\u003c\/strong\u003e delivering \u003cstrong\u003e4 × 250 watts RMS at 2 ohms\u003c\/strong\u003e — 2000 watts peak — in a slim chassis measuring just 14.7 cm × 25.9 cm × 4.8 cm. Built for enthusiasts who demand full-range amplification without sacrificing trunk space or install flexibility, the VL20004 powers component speaker sets, coaxial speakers, and mid-bass drivers with clean, high-headroom output across a frequency range of \u003cstrong\u003e10Hz to 40kHz\u003c\/strong\u003e. Its Full Range Class D topology runs at \u003cstrong\u003e82% efficiency\u003c\/strong\u003e, keeping heat low and power delivery consistent even during extended high-volume listening.\u003c\/p\u003e\u003cp\u003eThe VL20004 features independent \u003cstrong\u003ehigh-pass and low-pass filters (50Hz–250Hz)\u003c\/strong\u003e on each channel pair, giving you precise crossover control for a properly staged soundstage without an external processor. A wide \u003cstrong\u003einput sensitivity range of 0.2V–6V\u003c\/strong\u003e ensures seamless integration with factory head units, aftermarket decks, and DSP outputs. With a \u003cstrong\u003edamping factor of 100\u003c\/strong\u003e, the amp delivers tight, controlled output to your speakers for accurate midrange and high-frequency reproduction. The 9V–16V operating range makes it compatible with virtually any 12V vehicle electrical system, and the compact 4.8 cm mounting depth opens up under-seat and under-dash install locations that full-size 4-channel amps simply can't reach.\u003c\/p\u003e\u003cp\u003eAt \u003cstrong\u003eTrinity Car Audio\u003c\/strong\u003e, the Alliance Audio VL20004 is an ideal choice for building a full front stage — pair it with a quality set of component speakers up front and coaxials in the rear, or bridge channels 3 and 4 to drive a mid-bass subwoofer while channels 1 and 2 handle your tweeters and mids. Whether you're upgrading a factory system or building a clean, space-efficient custom install, the VL20004 delivers the power, precision, and compact footprint to get it done right.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the Alliance Audio VL20004?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 × 250W RMS at 2 Ohms:\u003c\/strong\u003e Real-world power across all four channels for crisp, dynamic full-range sound reproduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-Compact Class D Design:\u003c\/strong\u003e At just 14.7 × 25.9 × 4.8 cm, it fits under seats, behind panels, and in tight trunk corners where standard 4-channel amps won't go.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e82% Efficiency Rating:\u003c\/strong\u003e Full Range Class D topology runs significantly cooler than Class A\/B, reducing heat buildup and extending amp longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10Hz–40kHz Frequency Response:\u003c\/strong\u003e Full-range output from deep sub-bass extension to crystal-clear high-frequency detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-In High \u0026amp; Low Pass Filters (50–250Hz):\u003c\/strong\u003e Dial in your crossover points on each channel pair without an external processor or DSP.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Input Sensitivity (0.2V–6V):\u003c\/strong\u003e Plug directly into factory head units or aftermarket decks without a line output converter in most applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBridgeable Channels:\u003c\/strong\u003e Bridge channels 3 \u0026amp; 4 to power a mid-bass driver or small subwoofer while channels 1 \u0026amp; 2 handle your front stage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDamping Factor of 100:\u003c\/strong\u003e Delivers controlled, accurate speaker movement for tight midrange and clean high-frequency output.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpeaker Pairing \u0026amp; Wiring Recommendations\u003c\/h2\u003e\n\u003cp\u003eThe VL20004 is best matched with component speakers or coaxials rated between 75–250W RMS per channel. For a front stage build, run channels 1 and 2 to a set of 6.5\" component speakers (tweeters and woofers) and channels 3 and 4 to rear coaxials or a second set of components. To bridge channels 3 and 4 for a mono mid-bass output, ensure the bridged load is no lower than 4 ohms. Wire the amp with a minimum 4-gauge power and ground cable, fused within 18 inches of the battery. Set the high-pass filter between 80–100Hz to keep low-frequency content out of your speakers and protect them from over-excursion.\u003c\/p\u003e\n\n\u003ch2\u003eFull Specifications\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAlliance Audio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eVL20004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier Class\u003c\/td\u003e\n\u003ctd\u003eClass D (Full Range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Power\u003c\/td\u003e\n\u003ctd\u003e2000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRMS Power @ 2Ω \/ 14.4V\u003c\/td\u003e\n\u003ctd\u003e4 × 250W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRMS Power @ 4Ω \/ 14.4V\u003c\/td\u003e\n\u003ctd\u003e4 × 125W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e10Hz – 40kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal-to-Noise Ratio\u003c\/td\u003e\n\u003ctd\u003e90dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd\u003e0.2V – 6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDamping Factor\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Efficiency\u003c\/td\u003e\n\u003ctd\u003e82%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e9V – 16V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Pass Filter\u003c\/td\u003e\n\u003ctd\u003e50Hz – 250Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow Pass Filter\u003c\/td\u003e\n\u003ctd\u003e50Hz – 250Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Current Draw\u003c\/td\u003e\n\u003ctd\u003e80A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMusic Current Draw\u003c\/td\u003e\n\u003ctd\u003e42A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × L × H)\u003c\/td\u003e\n\u003ctd\u003e14.7 cm × 25.9 cm × 4.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the VL20004 with a factory head unit?\u003c\/strong\u003e\u003cbr\u003eYes. The 0.2V–6V input sensitivity range makes it compatible with low-voltage factory outputs in most vehicles. No line output converter is required in the majority of OEM applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I bridge the VL20004 for more power?\u003c\/strong\u003e\u003cbr\u003eYes — channels 3 and 4 (and channels 1 and 2) can be bridged for higher mono output. When bridging, ensure the speaker load is no lower than 4 ohms to keep the amp stable and within its thermal limits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat speakers work best with this amp?\u003c\/strong\u003e\u003cbr\u003eComponent speaker sets or coaxials rated 75–250W RMS per channel are ideal. 6.5\" or 6×9\" speakers in the 4-ohm range will give you the best balance of power and efficiency from the VL20004.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power wire gauge do I need?\u003c\/strong\u003e\u003cbr\u003eUse a minimum 4-gauge power and ground cable. With a max current draw of 80A, install an 80A inline fuse within 18 inches of the battery for safe, reliable operation.\u003c\/p\u003e","brand":"Alliance Audio","offers":[{"title":"Default Title","offer_id":43697598955587,"sku":"VL20004","price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/9575\/7123\/files\/VL20004_Front-1.png?v=1787241737","url":"https:\/\/www.trinitycaraudio.com\/products\/alliance-audio-vl20004-4-channel-class-d-amplifier","provider":"Trinity Car Audio","version":"1.0","type":"link"}