{"product_id":"hosyond-zk-tb21-bluetooth-5-0-2-1-channel-subwoofer-amplifier-board-50w-50w-100w","title":"Hosyond ZK-TB21 Bluetooth 5.0 2.1 Channel Subwoofer Amplifier Board – 50W+50W+100W","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Hosyond ZK-TB21 is a compact, high‑efficiency amplifier board designed for DIY speakers and home theater builds. This 2.1 channel subwoofer amplifier combines a robust power stage with precise tone controls, delivering a clear midrange, solid bass, and articulate highs without taking up much space in your project enclosure.\u003c\/p\u003e\n\u003ch3\u003ePerformance and sound shaping\u003c\/h3\u003e\n\u003cp\u003eBuilt around the TPA3116D2 HiFi driver, the board supports a total output of 50W + 50W for the stereo channels and 100W for the sub, with distortion kept very low at a THD of ≤0.1%. The design uses high-quality filter inductors to help maintain a full, clean sound across a wide frequency range, making it a versatile choice for compact home theater or DIY speaker systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2.1 channel configuration with strong sub-woofer emphasis\u003c\/li\u003e\n  \u003cli\u003eLow distortion for clearer dialogue and crisp music highs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnectivity and inputs\u003c\/h3\u003e\n\u003cp\u003eEnjoy flexible playback options with Bluetooth 5.0 and a 3.5 mm AUX input. If your device supports Bluetooth, you can pair wirelessly for quick setups; if not, the AUX input provides a reliable wired path. When using AUX, ensure the Bluetooth link is disconnected to avoid signal conflicts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBluetooth 5.0 for longer range and stable streaming\u003c\/li\u003e\n  \u003cli\u003eAUX input via 3.5 mm jack for wired playback\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSafety, reliability, and wiring\u003c\/h3\u003e\n\u003cp\u003eDesigned with practicality in mind, the board includes several protection features and easy wiring options. It accepts a wide DC input range of 12–24V and incorporates protection against overheating, reverse polarity, overvoltage, and undervoltage. Copper DC connectors and insulated terminals support high current with safer, neater wiring; a free DC lead is included to simplify setup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOverheat, reverse connection, circuit breaker protections\u003c\/li\u003e\n  \u003cli\u003eOvervoltage and undervoltage safeguards\u003c\/li\u003e\n  \u003cli\u003e12–24V input for flexible power options\u003c\/li\u003e\n  \u003cli\u003eCopper DC connectors and insulated terminals for safe high‑current wiring\u003c\/li\u003e\n  \u003cli\u003eFree DC lead included for quick wiring and integration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTone control and practical use cases\u003c\/h3\u003e\n\u003cp\u003eIndependent high and low bass control knobs allow you to tailor the low end and overall balance to suit your room and speaker pairings. This makes it a practical choice for home theater projects, small to medium DIY speaker setups, and hobbyist builds where you want tangible control over sound character without changing components.\u003c\/p\u003e\n\u003cp\u003eWhether you are assembling a compact stereo system, upgrading a subwoofer array, or building a custom theater rig, the ZK-TB21 provides a solid, adaptable platform. It emphasizes clarity, offers flexible inputs, and keeps essential protections in place so you can experiment with different configurations with reduced risk. The result is a usable, value-friendly option for enthusiasts who enjoy hands-on audio projects without promising fixed outcomes.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What devices can I connect to the Hosyond ZK-TB21?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: You can pair via Bluetooth 5.0 or use the 3.5 mm AUX input for wired playback.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What power and safety features does it offer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It accepts 12–24V DC and includes overheat, reverse connection, and over\/undervoltage protections.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hosyond","offers":[{"title":"Default Title","offer_id":48410552631453,"sku":"B0CCJQBWST","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/hosyond-zk-tb21-front-panel.jpg?v=1781208486","url":"https:\/\/nexoltic.com\/products\/hosyond-zk-tb21-bluetooth-5-0-2-1-channel-subwoofer-amplifier-board-50w-50w-100w","provider":"Nexoltic","version":"1.0","type":"link"}