Amazon.com: 320W Power Amplifier Board with Subwoofer 2.0 Channel 160W×2, 15V-36V Audio Power Amplifier Module with Treble and Bass Control,Black : Electronics
1200W Car Audio Power Amplifier Subwoofer Power Amplifier Board Audio Diy Amplifier Board - AliExpress
Subwoofer Audio Amplifier Using TDA2003 IC
Amazon.com: ZK-1002T Bluetooth 5.0 Amplifier Board 2.1 200W HiFi Subwoofer Audio AMP with Treble and Bass Control BT and AUX Inputs, DC 9-24V 2.0 Channel Stereo AMP Module for DIY Speakers, Password
Building A DIY Sealed Subwoofer | Audioholics
Amazon.com: Clyxgs TPA3116D2 2.1 Digital Power Amplifier Board, 2x80W+100W(Bass) Audio Stereo AMP Module for Audio System DIY Speakers 12-26V : Electronics