{"product_id":"as21p-bluetooth-5-1-2-1-channel-tpa3255-power-amplifier-board-high","title":"AS21P Bluetooth 5.1 2.1 Channel TPA3255 Power Amplifier Board - High","description":"\u003cp\u003eIn this review the AS21P Bluetooth 5.1 digital power amplifier board is evaluated for DIY audio builders and custom home theater installs. The bottom line: it is a compact, high-power 2.1 amplifier module that delivers serious output for left\/right speakers and a subwoofer, making it a strong choice for anyone needing flexible inputs and lots of headroom. Our review found the board best for users who can supply an appropriate DC source and want \u003cstrong\u003ehigh-fidelity\u003c\/strong\u003e output without a full prebuilt receiver.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.1:\u003c\/strong\u003e Offers stable wireless streaming up to about 15 meters, convenient when adding the board to a living-room or workshop system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh output power:\u003c\/strong\u003e The 2.1 channel layout uses dual TPA3255 chips to deliver strong left and right channel power and a powerful dedicated subwoofer channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide voltage range:\u003c\/strong\u003e Runs from 18 to 50VDC (limit 53V) so it adapts to different power supplies and gains output with higher voltage within safe limits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple inputs:\u003c\/strong\u003e Supports Bluetooth, AUX and U disk sound card input methods for flexible source options in custom installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtections:\u003c\/strong\u003e Built-in undervoltage, overheating, overcurrent and short circuit protections help protect the amplifier during heavy use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis board is ideal for experienced DIYers, custom home theater installers or hobbyists who want a compact amplifier with a dedicated sub channel and flexible inputs. The integrated potentiometer version simplifies control in a compact 15 x 12 x 4 cm package and is useful where space is limited but high power is required.\u003c\/p\u003e\n\u003cp\u003eIt is not for users who expect a plug-and-play powered speaker with a built-in regulated power supply; you must provide a suitable DC supply (recommended 36-48V with adequate current) and observe polarity carefully since there is no reverse-polarity protection. Novice users should seek a finished amplifier product instead.\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 potential output using dual TPA3255 chips for powerful stereo and subwoofer performance.\u003c\/li\u003e\n\u003cli\u003eBluetooth 5.1 plus AUX and U disk support gives flexible connectivity for many setups.\u003c\/li\u003e\n\u003cli\u003eRobust protection features reduce risk of damage from common fault conditions during use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNo input anti-reverse connection protection, so reversed power leads can damage the board if connected incorrectly.\u003c\/li\u003e\n\u003cli\u003eRequires an external DC supply sized for high current, which adds cost and assembly complexity for some users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eAS21P \/ AS21PB (potentiometer integrated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e2.1 (left, right + subwoofer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier chip\u003c\/td\u003e\n\u003ctd\u003eTwo TPA3255\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth\u003c\/td\u003e\n\u003ctd\u003eVersion 5.1, ~15 m transmission distance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking voltage\u003c\/td\u003e\n\u003ctd\u003e18-50VDC (limit 53V); recommended 36-48V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical size\u003c\/td\u003e\n\u003ctd\u003eIntegrated potentiometer: 15 x 12 x 4 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage contents\u003c\/td\u003e\n\u003ctd\u003e1 x potentiometer integrated AS21P (board only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe AS21P Bluetooth 5.1 2.1 amplifier board is a strong value for skilled builders who need \u003cstrong\u003ehigh-power\u003c\/strong\u003e stereo and subwoofer capability in a compact module. It delivers flexible inputs and built-in protections, but expects the user to provide a proper DC supply and respect polarity. For DIY home audio projects that require serious output without buying a full receiver, it is an excellent choice.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage and current should I use?\u003c\/strong\u003e\u003cbr\u003eUse a DC supply between 36 and 48V with sufficient current (for example 12A) to feed the high-power outputs safely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include protection circuits?\u003c\/strong\u003e\u003cbr\u003eYes. The board has undervoltage, overheating, overcurrent and short circuit protection but no reverse-polarity protection on the input.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat inputs are supported?\u003c\/strong\u003e\u003cbr\u003eBluetooth 5.1, AUX and U disk sound card input methods are supported for flexible source options.\u003c\/p\u003e","brand":"TKOWTB","offers":[{"title":"Default Title","offer_id":46779407007963,"sku":"B0DTGB265D","price":66.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61TTtqoBs6L._SL1001.jpg?v=1747854678","url":"https:\/\/gearmusthave.com\/products\/as21p-bluetooth-5-1-2-1-channel-tpa3255-power-amplifier-board-high","provider":"GearMustHave","version":"1.0","type":"link"}