Ampere Audio AA-3.0 RVE v.4 18" Subwoofer - SSA STORE
AD4212 D4 | AD Store
Amazon.com: Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control for DIY Bluetooth Audio and Store Home Theater : Electronics