ST-838 2.1CH Audio Power Amplifier,Stereo Bass Car Home Audio Power Amplifier with Two Pairs of Speaker Output/Subwoofer Output and 3.5mm Audio Input for Car Home Theater Audio Stereo System

[Bass, Treble and Subwoofer Volume Controls] Daakro's ST-838 audio amplifier is designed with master volume, treble and bass control knobs for finer adjustment of sound effects, fun and playability. In addition to the master volume, treble and bass control knobs, a sub volume control knob is specially designed. You can adjust the volume of the passive subwoofer and the two passive speakers separately as needed.