Bass boost remote: every new class-d amplifier has a bass boost remote controller for optimal bass level adjustment according to listening preferences and music characteristics. Gain control: appropriate gain control adjustment can be made to ensure loud, clear, distortion-free music. 1600W MAX Class D Mono Amplifier , 300wX1(RMS), Variable Low Pass Filter, Bass Boost with Remote Control, Highly Reliable Circuit Design (1ohm Applicable), Automatic Signal Sensing and Turn On.