Fosi Audio TB21 Bluetooth Sound Power Amplifier Board 2.1 Channel Mini Wireless Digital Amp Module 50W X2 100W Subwoofer 211011 From Jiao10, $24.59

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TB10A 2 Ch Amplifier Receiver Hi-Fi Class D Integrated Amp – Fosi Audio

TB10A 2 Ch Amplifier Receiver Hi-Fi Class D Integrated Amp – Fosi Audio

Diitao ZK-TB21 2.1 Channel Subwoofer Amplifier Board with Treble and Bass Control DIY Wireless Speakers AMP Board DC 12-24V Audio Power Amplifier Module for Theater Speakers DIY Speakers : Electronics

TB21S 2*50W+100W Bluetooth 5.1 Digital Power Amplifier Board AUX 2.1 Stereo Home Music Wireless USB Sound Card Module Audio AMP - AliExpress

Input and Output: The power amplifier board supports AUX+BT sound source input, and supports subwoofer + left and right channel output. Easy to

Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W 100W, DC12V 24V Audio Power Amplifier Module for DIY Home Theater Audio System

Diitao ZK-TB21 2.1 Channel Subwoofer Amplifier Board with Treble and Bass Control DIY Wireless Speakers AMP Board DC 12-24V Audio Power Amplifier Module for Theater Speakers DIY Speakers : Electronics

Fosi Bluetooth Amp Module - Mini Wireless Stereo Audio Board – Fosi Audio

TB21S 2*50W+100W Bluetooth 5.1 Digital Power Amplifier Board AUX 2.1 Stereo Home Music Wireless USB Sound Card Module Audio AMP - AliExpress

Fosi Audio ZK-TB21 Bluetooth 5.0 Stereo Audio Receiver Amplifier Board 2.1Channel Mini Wireless Digital AUX Amp Module Bass and Treble Control for Home Passive Speakers Subwoofer TPA3116D2 50Wx2+100W : Electronics