MHD900/5 - JL Audio 5-Channel Marine HD Series Amplifier MHD900/5 JL Audio 5-Channel 100 Watts RMS x 4 @ 4 Ohms + 500 Watts RMS x 1 Marine HD Series Amplifier Variable high-pass filter on front and rear channels (50-500 Hz, 12 or 24dB/octave) Variable low-pass filter on subwoofer channel (50-500 Hz, 12 or 24dB/octave) Subsonic filter on sub channel (24 dB/oct at 30 Hz) MOSFET power and output stages