Amazon.com: Subwoofer Amplifier Board, Arylic WiFi & Bluetooth 5.0,50W2 Stereo Pair + 100W Sub Class D Stereo Amplifier,Multiroom/multizone Home Audio Amplifier Board for DIY Speaker-Up2stream Amp 2.1 : Electronics
TDA7379 Power Amplifier DC 12V~24V Audio Amplifier Board Module 13W+13W 4Ω Left
24V Digital Bluetooth Stereo Amplifier Board Subwoofer Dual Microphone Speaker – ASA College: Florida
Subwoofer Amplifier Board 300w Low Pass Filter Subwoofer Pure Home Theater Active Subwoofer Amplifier, Amplifier For Subwoofer - Home Theater Amplifiers - AliExpress