{"product_id":"2-1-channel-bluetooth-amplifier-board-zk-mt21-50w2-100w-diy-audio","title":"2.1 Channel Bluetooth Amplifier Board ZK-MT21 - 50W2 +100W DIY Audio","description":"\u003cp\u003eOur review of the 2.1 Channel Bluetooth Amplifier Board ZK-MT21 finds it best suited to DIY speaker builders and home theater tinkerers who need flexible inputs and tangible bass control. The single biggest reason to buy is its combination of Bluetooth 5.0 connectivity and a true 2.1 channel output of 2x50W plus 100W subwoofer power, which delivers impactful low end without requiring a separate amplifier for the sub. The board is practical, compact, and built for repeated use, and the included copper DC connectors and barrier terminals make wiring straightforward for hobbyists and installers.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.0:\u003c\/strong\u003e Reliable wireless pairing with a range up to about 49 ft unobstructed makes connecting phones or tablets simple for streaming audio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Inputs:\u003c\/strong\u003e A 3.5mm AUX input lets you attach TVs, media players, or legacy sources when Bluetooth is not desired.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.1 Output:\u003c\/strong\u003e The rated 2x50W + 100W configuration provides distinct left\/right channels plus a dedicated subwoofer output for stronger bass impact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreble and Bass Control:\u003c\/strong\u003e On-board tone knobs let you tailor sound layering and sub emphasis without external equalizers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Features:\u003c\/strong\u003e Short-circuit, overcurrent, overheating, and reverse-connection protections help prevent damage during installation and heavy use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Connectors:\u003c\/strong\u003e Copper DC connectors and barrier terminals handle higher current without overheating and include a DC head lead for easy hookup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe board is ideal for DIY speaker builders upgrading bookshelf speakers, custom home theater projects that need a compact amplifier with sub output, and small commercial audio setups where wired and wireless inputs are both useful. Installers who appreciate on-board tone controls will like the quick ability to shape sound without adding extra hardware.\u003c\/p\u003e\n\u003cp\u003eThose seeking a fully finished consumer receiver with remote control, a built-in power supply, or plug-and-play enclosure should look elsewhere; this product expects some familiarity with wiring and a separate power supply to be sourced and installed.\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\u003eClear benefit from Bluetooth 5.0 plus AUX for versatile source options.\u003c\/li\u003e\n\u003cli\u003ePowerful 2.1 channel output that produces pronounced bass when paired with a suitable subwoofer.\u003c\/li\u003e\n\u003cli\u003eBuilt-in protection circuitry reduces risk during real-world use and installation.\u003c\/li\u003e\n\u003cli\u003eQuality copper connectors and barrier terminals support reliable high-current connections.\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 compatible power supply and basic wiring skills, so it is not a plug-and-play boxed unit.\u003c\/li\u003e\n\u003cli\u003eNo remote control or built-in enclosure included, which may be inconvenient for some end users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Configuration\u003c\/td\u003e\n\u003ctd\u003e2.1 channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output\u003c\/td\u003e\n\u003ctd\u003e2 x 50W + 100W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWireless Standard\u003c\/td\u003e\n\u003ctd\u003eBluetooth 5.0 (up to ~49 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eBluetooth and 3.5mm AUX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eShort-circuit, overcurrent, overheating, reverse-connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectors\u003c\/td\u003e\n\u003ctd\u003eCopper DC connectors, barrier terminals, DC head lead included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ZK-MT21 amplifier board is a strong value for DIYers and small home theater upgrades because it combines modern Bluetooth streaming with a true 2.1 output and on-board tone controls. It is not a finished consumer receiver, but for those willing to supply power and do basic wiring, it delivers reliable protection, solid connectors, and noticeable bass performance at an accessible price.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include a power supply?\u003c\/strong\u003e\u003cbr\u003eNo, the board includes a DC head lead but requires a separate compatible power supply; no adapter or battery is included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I connect a TV directly?\u003c\/strong\u003e\u003cbr\u003eYes, you can use the 3.5mm AUX input for TV or media player audio when Bluetooth is not preferred.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the Bluetooth range long?\u003c\/strong\u003e\u003cbr\u003eBluetooth 5.0 provides up to about 49 ft unobstructed; walls and other obstacles will reduce that distance.\u003c\/p\u003e","brand":"HOCHANAN","offers":[{"title":"Default Title","offer_id":46767476965595,"sku":"B0DQ3YWL94","price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51xWqj6-t6L._SL1000.jpg?v=1747854580","url":"https:\/\/gearmusthave.com\/products\/2-1-channel-bluetooth-amplifier-board-zk-mt21-50w2-100w-diy-audio","provider":"GearMustHave","version":"1.0","type":"link"}