2 x 100W + 200W 2.1 Channels Bluetooth Audio Amplifier Board - TSA7500
MINI HIFI AUDIO Class D TPA3116 2.1 Power amplifier board NE5532 2*50W
XH-A355 Digital Power Amplifier Board 2.1 Channel with Tuning HD Sound Quality 2X15W+30W Gadgets - Newegg.com
Lm3886 Amplifier High Power | Lm3886 2 1 Audio Amplifier | Lm3886 2 Stereo Amplifier - Home Theater Amplifiers - Aliexpress
Amazon.com: Bluetooth Power Amplifier Board Stereo - HiFi 2.1 Channel 2X220W+350W Bluetooth 5.1 Audio Amplifier Board 12-38V Digital Power Amplifier Module Subwoofer Control with AUX/Bluetooth/USB Flash Drive : Electronics
2.1 Channel Subwoofer Amplifier Board High Power Audio Amplifier Board Module (200W) (motherboard and knob), Premium - Walmart.com
2.1 Amplifier 50W x 50W x 100W with Built-In Bluetooth 3.0 Backlit LCD Screen, and IR Remote
Amazon.com: DC12V-24V 2.1 Channel TPA3116 Subwoofer Amplifier Board High Power Bluetooth Audio Amplifier Board 50W+50W+100W (Bluetooth Amp),Bluetooth Amp : Electronics