{"product_id":"bluetooth-amplifier-board-zk-ht21-2-1-channel-160wx2-220w-compact","title":"Bluetooth Amplifier Board ZK-HT21 2.1 Channel 160Wx2+220W - Compact","description":"\u003cp\u003eIn this review of the Bluetooth Amplifier Board ZK-HT21 the bottom line is simple: it is a compact, high-power 2.1 channel module aimed at hobbyists and DIY home speaker builders who want flexible inputs and serious bass. The reviewer found the board delivers clear stereo with a dedicated subwoofer channel and useful tone controls, making it a practical choice for someone assembling a bookshelf-plus-subwoofer system. Setup requires an appropriate DC 15-36V supply and basic wiring skills, but the sound and protection features justify the modest learning curve.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.1 Channel Output:\u003c\/strong\u003e Provides separate left\/right channels plus a dedicated subwoofer channel so users can drive two passive speakers and a powered sub for fuller home audio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Power Ratings:\u003c\/strong\u003e Delivers 160W per main channel and 220W to the subwoofer, enabling it to drive mid- to high-power speakers and produce strong low-end impact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTPA7498E Class D Chips:\u003c\/strong\u003e Uses two TPA7498E amplifier chips for low distortion and efficient operation across the audio band, helping achieve clear, high-definition sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple Inputs:\u003c\/strong\u003e Built-in Bluetooth 5.0 plus USB flash, USB sound card and 3.5mm AUX let users connect phones, flash drives or wired sources without extra hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Tone and Subwoofer Control:\u003c\/strong\u003e Treble and bass controls, independent subwoofer volume and a 20-200Hz frequency knob let listeners tune the response to room and speaker choices.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection and Cooling:\u003c\/strong\u003e Over-voltage, under-voltage, overheat and short-circuit protections along with a long-life silent fan provide reliability during extended use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis amplifier board is best for DIY audio builders, hobbyists and anyone comfortable soldering or wiring who wants a compact, high-power 2.1 solution for home speakers. It fits projects where a single compact amp needs to power two full-range passive speakers and a dedicated subwoofer while offering tone shaping and modern inputs like Bluetooth 5.0.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for users who want a fully enclosed, plug-and-play hi-fi receiver with remote control and rack styling; likewise, those without a suitable DC power supply or basic electronics skills should look for a finished consumer amplifier 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\u003eHigh output power for both main channels and subwoofer, producing impactful bass when paired with a capable sub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.0 and multiple inputs\u003c\/strong\u003e provide flexible source options for streaming and local playback.\u003c\/li\u003e\n\u003cli\u003eTone controls and sub frequency adjustment allow precise tuning for room acoustics and speaker choice.\u003c\/li\u003e\n\u003cli\u003eBuilt-in protections and a silent cooling fan improve reliability in extended sessions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRequires an external DC 15-36V\/8A (or higher) power supply and basic wiring; not a ready-made consumer unit.\u003c\/li\u003e\n\u003cli\u003eBoard format may need an enclosure for permanent installations to meet aesthetic or safety preferences.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\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\u003ePower Output\u003c\/td\u003e\n\u003ctd\u003e160W x2 + 220W subwoofer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier Chips\u003c\/td\u003e\n\u003ctd\u003eTPA7498E class D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eBluetooth 5.0, USB flash, USB sound card, 3.5mm AUX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003eDC 15-36V (recommended supply \u0026gt;=8A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubwoofer Frequency\u003c\/td\u003e\n\u003ctd\u003eAdjustable 20-200Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eOver-voltage, under-voltage, overheat, short-circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ZK-HT21 Bluetooth Amplifier Board is a strong value for DIYers who need a compact, high-power 2.1 module with modern inputs and tone controls. It excels when paired with capable passive speakers and a subwoofer and rewards users who can provide an appropriate DC supply and enclosure; the combination of TPA7498E chips, sub control and protection features makes it a practical, tunable foundation for home audio projects.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power supply does this board require?\u003c\/strong\u003e\u003cbr\u003eUse a DC 15-36V supply rated at 8A or higher; higher voltage\/current will increase available output but ensure the supply exceeds the amplifier's working power.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it drive two passive speakers and a subwoofer?\u003c\/strong\u003e\u003cbr\u003eYes, it is a 2.1 channel module designed to drive two passive speakers (4-8 ohms, 30-200W) plus a subwoofer (30-220W).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it support Bluetooth streaming?\u003c\/strong\u003e\u003cbr\u003eYes, the module includes Bluetooth 5.0 for faster transmission and improved decoding with a range up to about 15m (49ft) in open space.\u003c\/p\u003e","brand":"DideaECO","offers":[{"title":"Default Title","offer_id":48637356310747,"sku":"B0F3HSRQPV","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71WfPBfxzIL._SL1500.jpg?v=1778571906","url":"https:\/\/gearmusthave.com\/products\/bluetooth-amplifier-board-zk-ht21-2-1-channel-160wx2-220w-compact","provider":"GearMustHave","version":"1.0","type":"link"}