HOCHANAN 2.1 Bluetooth Amplifier Board 12–24V 50W+100W

HOCHANAN ZK-MT21 is a compact 2.1-channel Bluetooth amplifier board that powers left/right passive speakers plus a subwoofer, with tone controls and inputs for DIY home audio upgrades.

If you want to add modern wireless streaming and adjustable bass to passive bookshelf speakers, an old TV soundbar, or a custom speaker project, the ZK-MT21 delivers big output from a very small circuit board. The unit supports Bluetooth 5.0 streaming, a 3.5mm auxiliary input, and separate outputs for two stereo channels and a powered subwoofer. It’s designed for hobbyists and installers who prefer a hands-on approach: the board ships with top and bottom covers, knobs, screws, and a screwdriver so you can assemble it quickly and integrate it into enclosures.

How much speaker power can this amp actually drive?

The ZK-MT21 supplies up to about 50W per left/right channel into 4–8Ω speakers and can drive a subwoofer up to 100W. Output depends on your supply voltage and speaker impedance; using a higher-voltage DC supply yields more headroom and bass impact.

• Left/right channels: up to 50W each (4–8Ω).
• Subwoofer output: up to 100W peak.
• Recommended power input: 12–24V DC at 5A or greater (supply not included).
• Higher voltages (24V) provide stronger bass and louder overall volume.

Can I stream from my phone or connect a TV?

Yes — Bluetooth 5.0 lets you pair phones, tablets, and other Bluetooth sources within roughly 10 meters (about 33 feet). If you prefer a wired connection, the 3.5mm AUX input accepts any device with a headphone or line output, including TVs, computers, and media players.

• Wireless: Bluetooth 5.0 for stable streaming and easy pairing.
• Wired: 3.5mm AUX input for TVs and legacy devices.
• Ideal for switching between modern streaming and traditional audio sources.

What tone and bass controls are available for shaping sound?

The board includes a set of intuitive knobs to fine-tune the overall tone and bass behavior. Controls let you adjust master volume, subwoofer level and sub frequency (20–200Hz), plus bass and treble for the left and right channels, so you can tailor the sound for music or movies.

• Master volume for overall loudness control.
• Sub level and adjustable sub frequency (20–200Hz) for bass tuning.
• Separate bass and treble knobs for left/right channels.
• Fine adjustment suitable for small rooms or larger living spaces.

How easy is assembly and what accessories are included?

The package is aimed at DIYers and requires minimal assembly: attach the included covers, secure the fasteners, and add the knobs. The metal enclosure keeps the board cool during long listening sessions, and the kit includes basic hardware to get you started without sourcing extra parts.

• Includes top/bottom covers, 8 screws, 5 knob caps, and a screwdriver.
• Simple mounting — designed to be installed into custom or existing enclosures.
• Barely warms during extended use, reducing thermal concerns.

Who is this for? The HOCHANAN ZK-MT21 is best for hobbyists, tinkerers, and homeowners who want to upgrade passive speakers or build custom audio projects with modern streaming and subwoofer support. It’s also useful for refurbishing older soundbars and for anyone needing compact, adjustable amplification for TV or desktop audio without buying a full-size receiver. Note: a suitable 12–24V DC power supply is required but not included; choose a supply rated 5A or higher for optimal performance.