SW-501 TPA3118 2.1 Digital Amplifier Active Subwoofer Power AMP Board | eBay
TPA3116 100W Subwoofer Digital Power Amplifier Board TPA3116D2 Amplifi – Aideepen
Amazon.com: Nobsound 100W Subwoofer Amplifier Digital Power Sub Amp Audio Mini Bass Amp with Power Supply (Black) : Electronics
Amazon.com: Facmogu ST-838 2.1 Channel HiFi Stereo Subwoofer Amplifier, RMS 20Wx2+40W Mini Digital Audio Power Amplifier for Home Speakers, 80W Subwoofer Amplifier Audio Stereo Bass Amp with Power Supply - Black :
350W Subwoofer Amplifier Board Mono High Power Subwoofer A Amplifier Board DIY Subwoofer Speaker | Wish
M04 Mono Amplifier Subwoofer Amp 100W With Bass Power Amplifier – Fosi Audio
Amazon.com: Fosi Audio M03 200 Watt TPA3255 Subwoofer Amplifier Mini Mono Channel Audio Power Amp for Home Theater Full-Frequency and SUB Bass Switchable with 32V/5A Power Supply : Electronics
How to match subwoofers and amplifiers
SP2-12000-HT Dual Mono Subwoofer Rack Amplifier
A-9030/9050- Connecting a Subwoofer with Built-In Power Amplifier – Onkyo Product Support