{"product_id":"zk-tb21-2-1-channel-bluetooth-5-0-amplifier-board-200w-compact-hifi","title":"ZK-TB21 2.1 Channel Bluetooth 5.0 Amplifier Board 200W - Compact HiFi","description":"\u003cp\u003eOur review of the ZK-TB21 2.1 Channel Bluetooth 5.0 Amplifier Board finds it best suited to DIY speaker builders and hobbyists who want a compact, powerful amplifier with flexible inputs and tone control. The single biggest reason to consider this module is the combination of dual TPA3116D2 Class D outputs and Bluetooth 5.0 connectivity in a very small package, which delivers strong clean power for its size while keeping installation straightforward.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.0 wireless input:\u003c\/strong\u003e Quick pairing and stable streaming up to about 50 ft from phones or tablets thanks to the QCC3003 implementation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.1 channel output:\u003c\/strong\u003e Provides two channels of stereo plus a subwoofer output for fuller low end in compact speaker builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent treble and bass adjustment:\u003c\/strong\u003e Onboard controls let you shape the tonal balance without touching the source device.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual TPA3116D2 chips:\u003c\/strong\u003e Class D amplifier topology and shielding reduce distortion and deliver more efficient, low-noise power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective functions:\u003c\/strong\u003e Built-in over-voltage, under-voltage, over-heat and short-circuit protection help safeguard the module and attached speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall form factor:\u003c\/strong\u003e At roughly 110 x 70 x 21 mm (4.4 in x 2.75 in x 0.78 in) the module fits into small enclosures and is easy to mount.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis amplifier board is aimed at DIYers assembling compact bookshelf systems, desktop speaker projects, or a powered subwoofer add-on who need a compact \u003cstrong\u003eHiFi amplifier\u003c\/strong\u003e with both Bluetooth and AUX options. It is also useful for hobbyists who want onboard tone controls and protection circuits without building a separate preamp.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for audiophiles who demand reference-grade components or perfectly transparent wireless performance; some users reported variable Bluetooth connectivity and a few noted sound differences depending on source. Also, those wanting a consumer plug-and-play powered speaker with factory support should look elsewhere.\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\u003eCompact but powerful output thanks to dual TPA3116D2 chips and class D efficiency.\u003c\/li\u003e\n\u003cli\u003eOnboard treble and bass controls provide quick tone shaping without additional gear.\u003c\/li\u003e\n\u003cli\u003eMultiple protections and a shielded layout reduce interference and protect connected speakers.\u003c\/li\u003e\n\u003cli\u003eClear documentation on the protective plate simplifies installation for DIY builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBluetooth and sound quality received mixed feedback from some customers, so wireless performance can vary by environment and source device.\u003c\/li\u003e\n\u003cli\u003eAUX mode requires manual disconnection of Bluetooth, which is an extra step compared with automatic input switching.\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\u003eZK-TB21 2.1 Channel Amplifier Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e2.1 channel stereo + subwoofer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput power\u003c\/td\u003e\n\u003ctd\u003e100W + 100W (stereo channels), subwoofer supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth\u003c\/td\u003e\n\u003ctd\u003eBluetooth 5.0 with QCC3003 chip (approx. 50 ft range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e110 x 70 x 21 mm (4.4 in x 2.75 in x 0.78 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eOver-voltage, under-voltage, over-heat and short-circuit protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower input\u003c\/td\u003e\n\u003ctd\u003eDC 9-24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ZK-TB21 is a strong value for DIYers who need a compact, protected \u003cstrong\u003eBluetooth amplifier\u003c\/strong\u003e with tone controls and genuine power for small speaker systems. It combines efficient TPA3116D2 class D amplification and useful protections in a small footprint, making it a practical choice for projects where space, power and basic tuning matter.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this board run from a 12V car battery?\u003c\/strong\u003e\u003cbr\u003eYes, the amplifier accepts DC 9-24V, so a 12V supply is within the supported range, but ensure your power source can provide sufficient current for the desired output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes AUX input work while Bluetooth is connected?\u003c\/strong\u003e\u003cbr\u003eThe module requires Bluetooth to be disconnected to use AUX reliably, so switch off Bluetooth pairing when using the wired input.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this suitable for a powered subwoofer?\u003c\/strong\u003e\u003cbr\u003eYes, the 2.1 output supports a subwoofer channel and onboard tone controls help tailor the low end for a subwoofer application.\u003c\/p\u003e","brand":"ARRAROWN","offers":[{"title":"Default Title","offer_id":46781800251611,"sku":"B08L4D2Z79","price":26.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71gIaLf8wdL._AC_SL1500.jpg?v=1747851658","url":"https:\/\/gearmusthave.com\/products\/zk-tb21-2-1-channel-bluetooth-5-0-amplifier-board-200w-compact-hifi","provider":"GearMustHave","version":"1.0","type":"link"}