Hosyond ZK-TB21 Bluetooth 5.0 2.1 Channel Subwoofer Amplifier Board – 50W+50W+100W

Overview

The 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.

Performance and sound shaping

Built 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.

• 2.1 channel configuration with strong sub-woofer emphasis
• Low distortion for clearer dialogue and crisp music highs

Connectivity and inputs

Enjoy 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.

• Bluetooth 5.0 for longer range and stable streaming
• AUX input via 3.5 mm jack for wired playback

Safety, reliability, and wiring

Designed 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.

• Overheat, reverse connection, circuit breaker protections
• Overvoltage and undervoltage safeguards
• 12–24V input for flexible power options
• Copper DC connectors and insulated terminals for safe high‑current wiring
• Free DC lead included for quick wiring and integration

Tone control and practical use cases

Independent 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.

Whether 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.