Amazon.com: Diitao 50W×2+100W Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel, 12V-24V Audio Power Amplifier Module with Treble and Bass Control for DIY Bluetooth Audio ZK-MT21 : Electronics
ZK-MT21 2.1 Channel Bluetooth 5.0 Subwoofer Amplifier Board 50WX2+100W BBC | eBay
ZK-MT21 Bluetooth 5.0 Subwoofer Versterker Boord 50WX2 + 100W 2.1 Channel Power Audio Stereo Versterker
1 Stuk Kanaals Bluetooth Digitale Versterker Module Zk MT21 5.0 Power Home Theater Stereo Versterker - AliExpress