ZK-TB22 2.2-Channel Bluetooth Amplifier Board with Dual Subwoofer Outputs

Build a stereo system with two subwoofers using the ZK-TB22 amplifier board. Connect a Bluetooth, AUX, PC or USB audio source, then adjust treble, midrange and bass to shape your DIY speaker setup.

Features

• 2.2-channel configuration: left, right and two subwoofer outputs.
• Independent volume adjustment for stereo channels and dual subwoofers.
• Bluetooth with a supplier-listed transmission distance of up to 15 metres.
• Replaceable dual-package operational amplifiers and a reserved microphone expansion port.
• Listed protections: undervoltage, overheating, overcurrent, short circuit and reverse input polarity.

Specifications

• Supply: DC 12–24V. Recommended supply: DC 24V, 10A or higher.
• Supplier-listed maximum output: up to 75W per left/right channel and 145W per subwoofer channel.
• Left/right speaker compatibility: 20–75W, 4–8Ω.
• Subwoofer compatibility: 50–150W, 2–8Ω.
• Listed dimensions: integrated-potentiometer version 117 × 116mm; external-potentiometer version 117 × 101mm.

Included

One amplifier board and one screwdriver. Choose from the existing Style A and Style B options; the supplied listing does not map those option names to the potentiometer versions.

Power and connection notes

DC power only. Never connect AC power or a nominal 24V battery pack, whose full-charge voltage can exceed the board's limit. Use a stable power supply within the rated voltage range and with sufficient power capacity. Actual output depends on supply voltage and current, speaker impedance and audio input; maximum ratings are not guaranteed continuous output. Bluetooth takes priority, so disconnect it before using wired audio. This is a DIY component, not a complete speaker system.