{"product_id":"zkmt21-100w-bluetooth-amplifier-board-2-1-channel-hifi-subwoofer-amp","title":"ZKMT21 100W Bluetooth Amplifier Board - 2.1 Channel HiFi Subwoofer Amp","description":"\u003cp\u003eIn this review the ZKMT21 100W Bluetooth amplifier board is evaluated for hobbyists and small home audio projects who need a compact, powerful 2.1 solution. The bottom line: it suits builders who want reliable Bluetooth 5.0 streaming plus AUX input and dedicated subwoofer output in a board that is simple to install and adjust. The reviewer found the amp delivers solid performance for driving small to medium speakers and offers protection features that make it a dependable choice for custom enclosures and retrofit sound systems.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.0:\u003c\/strong\u003e Wireless streaming is stable and lets users pair phones or players without a cable for convenient audio sources.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUX and BT inputs:\u003c\/strong\u003e Dual input options provide flexible connectivity so users can switch between wired and wireless sources quickly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.1 channel output:\u003c\/strong\u003e Dedicated left, right and subwoofer outputs let listeners create a proper stereo plus low-frequency channel for fuller sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable controls:\u003c\/strong\u003e Frequency, volume, treble and bass adjustments allow tuning to room acoustics and speaker response for better sound balance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in protections:\u003c\/strong\u003e Anti reverse connection, overheat, overcurrent and short circuit safeguards help protect connected speakers and the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide voltage range:\u003c\/strong\u003e DC 12-24V operation gives flexibility for different power supplies and portable or fixed installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis board is aimed at DIY audio enthusiasts, makers building small powered speaker systems, and anyone upgrading an existing 2.1 setup who needs Bluetooth plus AUX connectivity. Its compact PCB form and adjustable tone controls make it a good match for custom subwoofer cabinets and multi-speaker arrangements up to moderate power.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for users who require built-in enclosure, pre-mounted connectors, or a finished consumer product; those wanting a plug-and-play powered speaker with cosmetic housing should look for a complete amplifier chassis 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\u003eBluetooth 5.0 and AUX inputs offer flexible source options for modern devices and legacy players.\u003c\/li\u003e\n\u003cli\u003e2.1 channel outputs and tone controls make it straightforward to tune a system with a dedicated subwoofer.\u003c\/li\u003e\n\u003cli\u003eProtection features reduce the risk of damage from wiring mistakes or thermal issues during use.\u003c\/li\u003e\n\u003cli\u003eOperates on DC 12-24V so it can be used with a variety of power supplies in bench or mobile setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAs a bare PCB it requires assembly and mounting hardware; buyers should be comfortable with basic wiring and installation.\u003c\/li\u003e\n\u003cli\u003eSpecification language suggests a wide power range but exact continuous wattage per channel is not listed, so high-end audiophile ambitions may be limited.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem Type\u003c\/td\u003e\n\u003ctd\u003ePower Amplifier Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e2.1 channel (left, right, subwoofer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking Voltage\u003c\/td\u003e\n\u003ctd\u003eDC 12-24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth Version\u003c\/td\u003e\n\u003ctd\u003eBT 5.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd\u003e500mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Input\u003c\/td\u003e\n\u003ctd\u003eBluetooth + AUX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ZKMT21 100W Bluetooth amplifier board is a practical, value-oriented choice for DIYers who need a compact 2.1 amplifier with reliable wireless streaming and tone controls. Its protection features and broad voltage compatibility make it a sensible component for custom speaker projects, offering strong real-world utility without the frills of a finished consumer amp.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this board support wired and wireless inputs?\u003c\/strong\u003e\u003cbr\u003eYes, it accepts both Bluetooth 5.0 and AUX inputs so you can use wireless devices or a wired source.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power supply is required?\u003c\/strong\u003e\u003cbr\u003eThe board runs from DC 12-24V; choose a supply that matches your speaker power needs and provides adequate current.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I adjust the bass and treble?\u003c\/strong\u003e\u003cbr\u003eYes, the board includes adjustable frequency, volume, treble and bass controls for system tuning.\u003c\/p\u003e","brand":"Zopsc","offers":[{"title":"Default Title","offer_id":46760642314459,"sku":"B0CWVFS14Q","price":18.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71LQlm23QoL._AC_SL1500.jpg?v=1747855049","url":"https:\/\/gearmusthave.com\/products\/zkmt21-100w-bluetooth-amplifier-board-2-1-channel-hifi-subwoofer-amp","provider":"GearMustHave","version":"1.0","type":"link"}