{"product_id":"zapco-hb-104d-ii-amp-4-channel-class-d-bridgeable-amplifier-4x100w-rms-copy-1","title":"Zapco ST-204D SQ III 4 Channel Class D Amplifier 4x200w RMS","description":"\u003cdiv\u003e\n\u003ch4\u003e\u003cstrong\u003eThe Zapco ST-204D SQ III is a 4-channel, full-range Class D amplifier rated at 4×200W RMS, part of Zapco's ST SQ III range. It delivers over 1,000W total output in a compact finned aluminium chassis.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eKey specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eChannels: 4, full range, Class D\u003c\/li\u003e\n\u003cli\u003ePower output: 4×200W RMS\u003c\/li\u003e\n\u003cli\u003eBridged output: 580W RMS at 4Ω\u003c\/li\u003e\n\u003cli\u003eTotal harmonic distortion: less than 0.5%\u003c\/li\u003e\n\u003cli\u003eSignal-to-noise ratio: approximately 90dB\u003c\/li\u003e\n\u003cli\u003eEfficiency: over 90%\u003c\/li\u003e\n\u003cli\u003eChassis: finned aluminium with internal cooling fan (activates as needed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eST-204D SQ III - 4-Channel Class D Sound Quality Amplifier\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ST-204D SQ III delivers competition-grade sound quality in a compact chassis. It is a full-range Class D amplifier with less than 0.5% total harmonic distortion and approximately 90dB signal-to-noise ratio, with over 90% Class D efficiency.\u003c\/p\u003e\n\u003cp\u003eBridged, the amplifier outputs 580W RMS at a 4Ω load — over 1,100W total from a compact unit. The finned aluminium chassis and only-when-needed internal fan manage heat when pushed hard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4-channel, full range, Class D\u003c\/li\u003e\n\u003cli\u003eRCA and speaker-level inputs\u003c\/li\u003e\n\u003cli\u003eVariable input gain control\u003c\/li\u003e\n\u003cli\u003eVariable electronic crossover\u003c\/li\u003e\n\u003cli\u003eVariable bass boost control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable class=\"cen-spec-table--grid\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003ePower @ 4Ω\u003c\/th\u003e\n\u003ctd\u003e4 x 200 watts RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eTHD @ Rated Power\u003c\/th\u003e\n\u003ctd\u003e\u0026amp;lt; 0.5%THD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003ePower @ 2Ω\u003c\/th\u003e\n\u003ctd\u003e4 x 290 watts RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003ePower Bridged @ 4Ω\u003c\/th\u003e\n\u003ctd\u003e2 x 580 W RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eSignal to Noise Ratio\u003c\/th\u003e\n\u003ctd\u003e\u0026amp;gt; 90dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eTHD + Noise\u003c\/th\u003e\n\u003ctd\u003e\u0026amp;lt; 0.1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e15Hz to 30KHz ±1dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eInput Sensitivity\u003c\/th\u003e\n\u003ctd\u003e.25v to 5v\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eNet Dimensions (mm)\u003c\/th\u003e\n\u003ctd\u003e160(W) x 58(H) x 300(L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align: left;\"\u003eOverall Dimensions (mm)\u003c\/th\u003e\n\u003ctd\u003e160(W) x 58(H) x 325(L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cstrong\u003eRelated Products:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/audiovisualworld.co.uk\/car-audio\/installation-accessories\/amp-wiring-kits\/4-awg-4-gauge\/connects2-ct35-4awg-4-gauge-1600-watt-amplifier-wiring-kit.html\"\u003e\u003cimg src=\"https:\/\/audiovisualworld.co.uk\/media\/catalog\/product\/cache\/1\/thumbnail\/65x\/040ec09b1e35df139433887a97daa66f\/P\/C\/PC4-20__92695.jpg\" alt=\"\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/audiovisualworld.co.uk\/collections\/amp-wiring-kits\" target=\"_blank\" title=\"https:\/\/audiovisualworld.co.uk\/collections\/amp-wiring-kits\" rel=\"noopener\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cstrong\u003e  Amp Wiring Kits\u003c\/strong\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cspan style=\"color: #000000; font-family: 'Times New Roman'; font-size: 16px; text-align: center;\"\u003e \u003c\/span\u003e\u003c\/div\u003e","brand":"Zapco","offers":[{"title":"Default Title","offer_id":54119388021002,"sku":"ST-204D SQ III","price":299.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0930\/4578\/4842\/files\/ST-204DSQIII-1.webp?v=1794500497","url":"https:\/\/audiovisualworld.co.uk\/products\/zapco-hb-104d-ii-amp-4-channel-class-d-bridgeable-amplifier-4x100w-rms-copy-1","provider":"Audio Visual World","version":"1.0","type":"link"}