{"product_id":"500w-digital-audio-power-amplifier-board-mono-channel-high","title":"500W Digital Audio Power Amplifier Board Mono Channel - High","description":"\u003cp\u003eIn this review of the 500W Digital Audio Power Amplifier Board, the bottom line is simple: this mono Class D amp board is for DIY audio builders and active speaker makers who need a high-efficiency, high-power stage with solid protection features. The reviewer found it delivers up to 500W into 4 ohm under the specified conditions, runs with greater than 90% efficiency, and includes multiple safeguards so it can be integrated into home theater or custom speaker projects with confidence. It is a raw power amplifier board, so a preamp is recommended if your source cannot deliver the required input sensitivity.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh output power:\u003c\/strong\u003e Delivers up to 500W (65V supply, 4 ohm, 10% THD) to drive demanding single-channel speakers in a compact board format.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh efficiency:\u003c\/strong\u003e Class D topology provides \u0026gt;=90% efficiency and low idle power loss, keeping heat and power draw down for long listening sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection suite:\u003c\/strong\u003e Built-in over-voltage, under-voltage, overheating, short-circuit and DC detection protect the amp and connected speakers from common fault conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal cutoff:\u003c\/strong\u003e The output will shut off if the heat sink FET temperature exceeds 100 C, preventing thermal damage under heavy load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSNR and distortion performance:\u003c\/strong\u003e Rated signal-to-noise ratio around 90dB and very low distortion at practical power levels, keeping mid-to-high fidelity for music and home theater use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication flexibility:\u003c\/strong\u003e Designed for home theater, active speakers and DIY audio projects as a mono channel power stage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis board is aimed at hobbyists and professional DIY builders assembling active speaker systems, subwoofer amplifiers, or single-channel home theater applications that require a dedicated power stage. It is especially useful where efficiency, compact size and robust protection are priorities.\u003c\/p\u003e\n\u003cp\u003eIt is not a complete consumer product: buyers who need integrated controls, a built-in preamp, or lower-voltage single-supply operation should look elsewhere, since the board expects a dual DC supply of 58-70V and an input sensitivity of about 1.5V RMS.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVery high power capability up to 500W when paired with a suitable 65V supply and 4 ohm load.\u003c\/li\u003e\n\u003cli\u003eExcellent efficiency (\u0026gt;=90%) reduces heat and power consumption compared with linear amplifiers.\u003c\/li\u003e\n\u003cli\u003eComprehensive protection including short-circuit, DC detection and thermal shutdown for safer operation.\u003c\/li\u003e\n\u003cli\u003eLow distortion at practical listening power (examples given for 380W and 280W with \u0026lt;0.1% THD).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRequires a high-voltage dual DC supply (58-70V) and a source with ~1.5V RMS input or an added preamp, so extra components are needed for many setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated output power\u003c\/td\u003e\n\u003ctd\u003e500W (65V, 4 ohm, 10% THD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply voltage\u003c\/td\u003e\n\u003ctd\u003eDual DC 58-70V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;= 90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e90dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e20Hz - 20KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeaker load\u003c\/td\u003e\n\u003ctd\u003e4-8 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput sensitivity\u003c\/td\u003e\n\u003ctd\u003e1.5V RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 500W Digital Audio Power Amplifier Board is a strong choice for builders who need a compact, efficient mono power stage with thorough protection features and high practical output. It represents good value when paired with the right high-voltage supply and a preamp if needed, delivering powerful, low-distortion performance for custom speakers and home theater subs.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a preamp?\u003c\/strong\u003e\u003cbr\u003eIf the source device cannot provide about 1.5V RMS input, add a preamp to reach the amplifier's input sensitivity and avoid driving limitations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat supply voltage is required?\u003c\/strong\u003e\u003cbr\u003eThe board requires a dual DC power supply in the 58-70V range, with 65V cited for rated output figures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it protect the speaker?\u003c\/strong\u003e\u003cbr\u003eYes, it includes output short-circuit protection, DC bias detection and will shut off the output if the FET temperature exceeds 100 C.\u003c\/p\u003e","brand":"Zopsc","offers":[{"title":"Default Title","offer_id":46779125956827,"sku":"B0869KD11Y","price":19.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61eEIH7FPFL._SL1001.jpg?v=1747854773","url":"https:\/\/gearmusthave.com\/products\/500w-digital-audio-power-amplifier-board-mono-channel-high","provider":"GearMustHave","version":"1.0","type":"link"}