DESC: Maximize the boom of your bass with the four-channel Boss Audio CH600 MOSFET amplifier, which provides an RMS power range of 75 to 200 watts over four channels (and 400 watts of peak performance across two bridgeable channels). It features variable gain control, a high-pass crossover, variable low-pass crossover, line- and speaker-level inputs, and a remote subwoofer level control. A MOSFET amplifier offers superior thermal stability, which provides the power supply a fast response, excellent linearity, and high efficiency.