MRV-F300 - Alpine 4-Channel 300W RMS V Power Series Amplifier MRV-F300 - Alpine 4-Channel 300W RMS Class D Amplifier MOSFET power supply Variable high- and low-pass filters (50-400 Hz, 12 dB/octave) New snap-on terminal covers for easy installation Dimensions: 7-7/8"W x 2-3/16"H x 7-7/8"D