Dive into the details of ST21PRO TPA3221 Bluetooth 5.0 2.1 Channel Power Audio Stereo Subwoofer Amplifier Board 100WX2+200W TREBLE Bass note tuning AMP and see what sets it apart. Created with one goal: to make your tasks simpler and more productive. Browse the latest deals at Ehamepx.baby — shipped quickly and reliably.