{"product_id":"zk-tb21-power-amplifier-board-bluetooth-5-1-tpa3116-2-1-channel","title":"ZK-TB21 Power Amplifier Board Bluetooth 5.1 TPA3116 - 2.1 Channel","description":"\u003cp\u003eOur review of the ZK-TB21 finds it best suited for DIY audio builders and small home theater projects who need a compact, highpower 2.1 amplification solution. The single biggest reason to consider it is the use of dual \u003cstrong\u003eTPA3116D2\u003c\/strong\u003e chips, which deliver clean stereo output and a dedicated subwoofer channel while keeping distortion low during extended use. Connection options include Bluetooth 5.1 and a 3.5mm AUX jack, and the board includes practical protection features that make it reliable for continuous operation.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual TPA3116D2 chips:\u003c\/strong\u003e Provides stereo plus subwoofer channels with sustained high power and low THD for clear playback at louder volumes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.1 channel output:\u003c\/strong\u003e Delivers a combined peak arrangement of 50W + 50W + 100W, suitable for bookshelf speakers plus a powered subwoofer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.1 and AUX inputs:\u003c\/strong\u003e Lets users stream wirelessly from phones or connect TVs and laptops via the 3.5mm jack for flexible source options.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIPEX antenna interface:\u003c\/strong\u003e The firstgeneration U.FL\/IPEX socket allows an external antenna to be added for more stable Bluetooth range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive protection:\u003c\/strong\u003e Builtin shortcircuit, overcurrent, overheat and antireverse protections help protect connected components and the board itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide DC input:\u003c\/strong\u003e Supports DC 12-24V, making it compatible with a variety of power supplies used in DIY and compact audio systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe ZK-TB21 is ideal for hobbyists assembling compact home audio systems, makers integrating an amplifier into small home theater cabinets, and anyone who wants a straightforward Bluetooth plus AUX 2.1 amplifier with protection circuitry. It is especially useful when space is limited but a dedicated subwoofer channel is desired.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for professional studio mastering or very highend audiophile setups where component selection and ultralow noise floor are critical. Buyers who need bundled speakers, an external antenna included, or an integrated enclosure should look elsewhere and be prepared to source those items separately.\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\u003eClean, sustained power from \u003cstrong\u003eTPA3116D2\u003c\/strong\u003e chips for reliable stereo and subwoofer performance.\u003c\/li\u003e\n\u003cli\u003eConvenient Bluetooth 5.1 streaming plus 3.5mm AUX for versatile connections.\u003c\/li\u003e\n\u003cli\u003eProtection features and wide DC input make it safe and flexible for DIY installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExternal Bluetooth antenna is supported but not included, so range improvements require an extra purchase.\u003c\/li\u003e\n\u003cli\u003eNo enclosure or speakers provided, which requires additional components for a finished system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration\u003c\/td\u003e\n\u003ctd\u003e2.1 channel (stereo + subwoofer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier chips\u003c\/td\u003e\n\u003ctd\u003eDual TPA3116D2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower output (peak)\u003c\/td\u003e\n\u003ctd\u003e50W + 50W + 100W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eBluetooth 5.1 and 3.5mm AUX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth antenna\u003c\/td\u003e\n\u003ctd\u003e1st generation IPEX (U.FL) interface, antenna not included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eShortcircuit, overcurrent, overheat, antireverse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC input\u003c\/td\u003e\n\u003ctd\u003eDC 12-24V\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 practical, valueoriented 2.1 amplifier board for DIY and compact home theater builds; its \u003cstrong\u003eTPA3116D2\u003c\/strong\u003e dualchip design and safety features deliver dependable, lowdistortion sound for most consumer use cases. Pick this board if you plan to assemble your own speakers or integrate an amp into an enclosure and want Bluetooth streaming plus robust protection without paying for excess features.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this board support external Bluetooth antennas?\u003c\/strong\u003e\u003cbr\u003eYes. It uses a 1st generation IPEX (U.FL) interface so you can attach an external 2.4 GHz antenna for improved range; the antenna is not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power supply is required?\u003c\/strong\u003e\u003cbr\u003eThe board accepts a DC input between 12V and 24V; choose a supply that can provide sufficient current for your speaker loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe to run continuously?\u003c\/strong\u003e\u003cbr\u003eThe amplifier includes shortcircuit, overcurrent, overheat and antireverse protections designed to support long operational periods.\u003c\/p\u003e","brand":"DAJUNGUO","offers":[{"title":"Default Title","offer_id":46779715125467,"sku":"B0DTYQQYRF","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71mYlZfS9dL._SL1500.jpg?v=1747854628","url":"https:\/\/gearmusthave.com\/products\/zk-tb21-power-amplifier-board-bluetooth-5-1-tpa3116-2-1-channel","provider":"GearMustHave","version":"1.0","type":"link"}