ZK-TB21 Bluetooth Amplifier Board,50W+50W+100W 2.1 Channel Subwoofer Amp Boar…
Subwoofer Audio Amplifier Board: This ZK-TB21 upgraded power amplifier is 2.1 channel, allows you to connect 2 passive speakers and drive a subwoofer. 50W 2+100W High Power Output: This TB21 audio amplifier has a maximum output power of 50W for the left and right channels, and a maximum output power of 100W for the subwoofer.