Wuzhi Audio ZK-MT21 2.1-Channel Bluetooth 5.0 Amplifier Board 50W+50W+100W

The ZK-MT21 is a compact 2.1-channel audio amplifier module for a stereo pair plus a passive subwoofer. It accepts Bluetooth 5.0 or 3.5 mm AUX input and provides separate controls for the main channels and subwoofer.

Key Features

• 2.1-channel output: left, right and subwoofer
• Rated maximum output: 50 W + 50 W stereo and 100 W subwoofer
• Bluetooth 5.0 and 3.5 mm AUX audio inputs
• Independent main volume, stereo treble/bass, subwoofer volume and subwoofer frequency controls
• External Bluetooth antenna and screw-terminal speaker outputs

Electrical Requirements

• Power input: DC 12-24 V, recommended 5 A supply for higher output levels
• Recommended speakers: 4-8 Ω, 20-100 W
• Available output depends on supply voltage/current, speaker impedance and source level.

Installation Notes

• Use a regulated DC supply with adequate current capacity.
• Power off before changing speaker or power wiring.
• Provide ventilation and avoid short circuits around the exposed board.
• Package includes the amplifier module and the mounting/control accessories shown for the selected option.