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Small green circuit board in black metal case with silver knobs and terminals

ZK-MT21 2.1 Channel Bluetooth 5.0 Amplifier Board 12V-24V Subwoofer Output Bass Treble Control

SKU CH-SJ07-MH3ZG

A compact 2.1-channel Bluetooth 5.0 amplifier board delivers 50 W per speaker channel and 100 W to a subwoofer from a 12–24 V supply

  • Drives bookshelf speakers with 50W per channel
  • Bluetooth 5.0 streams audio up to 33ft wirelessly
  • 24V supply unlocks 100W subwoofer output
  • Bass treble and sub frequency knobs shape your sound
  • Compact 93mm × 90mm board fits tight DIY enclosures

ZK-MT21 2.1 Channel Amplifier Board

This compact amplifier board powers a stereo pair and a subwoofer from a single DC supply. It is built for hobbyists upgrading bookshelf speakers, building a TV soundbar or assembling a portable boombox. The module includes all hardware needed for quick enclosure assembly.

Bluetooth 5.0 and AUX Input Limits

Wireless streaming works up to 10 metres in clear space, but walls and interference will reduce that range. The 3.5 mm AUX jack accepts a 500 mV signal from phones, computers or TVs without extra gain. Both inputs share the same pre-amplifier stage, so only one source plays at a time.

12 V to 24 V DC Power Determines Output

The board requires a 5 A or higher supply between 12 V and 24 V; higher voltage yields the rated 50 W per main channel and 100 W for the subwoofer. At 12 V the available power drops noticeably, so a 24 V adapter is needed for full output. No power supply is included.

Highlights

  • Drives bookshelf speakers with 50W per channel
  • Bluetooth 5.0 streams audio up to 33ft wirelessly
  • 24V supply unlocks 100W subwoofer output
  • Bass treble and sub frequency knobs shape your sound
  • Compact 93mm × 90mm board fits tight DIY enclosures

Specifications

No published specifications for this item yet.

Questions about this item

Should I run this ZK-MT21 board at 12 V or 24 V for the best output?

The board accepts DC 12-24 V / 5 A or above; a 24 V supply delivers the full 50 W per channel and 100 W to the subwoofer, while 12 V gives lower maximum power.

What does the 50 W per channel and 100 W subwoofer rating mean when I connect real speakers?

Each left/right channel can drive 4-8 Ω speakers rated 20-100 W with up to 50 W, and the mono subwoofer output can deliver 100 W to a matching passive subwoofer.

How far does the Bluetooth 5.0 link actually reach in a typical room?

Bluetooth 5.0 is specified for up to 10 m (33 ft) unobstructed; walls and interference will reduce the practical range.

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