ARRAROWN 2.1 Bluetooth Amplifier Board 160W×2 +220W

ARRAROWN ZK-HT21 is a compact 2.1-channel Bluetooth amplifier board that delivers up to 160W per stereo channel plus 220W for a subwoofer, with treble/bass controls and multiple inputs for DIY home speaker systems.

The ZK-HT21 mini amplifier module combines high-power Class D amplification, Bluetooth 5.0 streaming, USB and AUX connectivity, and adjustable subwoofer controls in a single board-ready package. It’s built around TPA7498E HiFi chips and low-noise preamplifier stages to minimize distortion while offering flexible control over tone and low-frequency output. Protective features and an integrated silent fan help keep the unit stable in prolonged use.

How much power does the ZK-HT21 actually provide?

This amplifier supplies 160W to each left and right channel and up to 220W to a dedicated subwoofer when paired with a suitable power supply. Output depends on speaker impedance and supply voltage; higher supply voltage and current yield greater available output.

• Left/right channels: 160W × 2 (for compatible 4–8Ω speakers)
• Subwoofer channel: up to 220W (supports 30–220W subs)
• Recommended supply: DC 15–36V, 8A or higher for full-range performance
• Power scaling: lower speaker impedance and higher supply voltage increase output

What inputs and streaming options are available for home audio setups?

The board includes Bluetooth 5.0 for wireless audio, a USB flash playback/sound-card input, and a 3.5mm AUX jack for analog devices. Bluetooth offers stable, low-latency streaming up to about 15 meters, while wired inputs provide straightforward integration with TVs, players, or DIY preamps.

• Bluetooth 5.0: lossless decoding and up to 15 m/49 ft range
• USB flash & USB sound card: direct playback and digital input
• 3.5mm AUX: connect phones, TVs, or mixers (disable Bluetooth first)
• Front-panel controls: adjust treble, bass, and subwoofer level/frequency

How do tone and subwoofer controls improve listening?

On-board treble and bass knobs let you tailor the overall tonal balance, while dedicated subwoofer level and 20–200Hz frequency controls let you dial the low end to suit room size and speaker placement. These tactile adjustments make the module useful for both music and home theater tunings.

• Treble and bass knobs: quick tonal shaping without external EQ
• Subwoofer volume: independent low-frequency level control
• Subwoofer frequency: 20–200Hz crossover adjustment for blending
• Useful for compensating room acoustics and speaker response

What safety and reliability features are included?

The ZK-HT21 includes multiple protection mechanisms to preserve the amplifier and attached speakers under stress. A long-life silent fan and heat management design help keep the TPA7498E chips within safe operating temperature during high-power use.

• Over-voltage and under-voltage protection to prevent supply issues
• Overheat and short-circuit protection to protect components
• Integrated silent fan for continuous thermal control without noise
• Enclosed case option available to protect the board in installations

Who is this for? The ARRAROWN ZK-HT21 is aimed at DIY audio builders, hobbyists upgrading bookshelf or tower speakers, and small home theater projects needing a compact high-power amplifier. It suits users who want tunable bass and treble, wired and wireless inputs, and the ability to drive a dedicated subwoofer while keeping a compact footprint and robust protection features.