JL Audio RD900/5 5-channel car amplifier — 75 watts RMS x 4 at 4 ohms + 500 watts RMS x 1 at 2 ohm5 channel car amplifier 75 watts RMS x 4 + 225 watts RMS x 1 at 4 ohms 100 watts RMS x 4 + 500 watts RMS at 2 ohms 200 watts RMS x 2 bridged at 4 ohms (4 ohm stable in bridged mode) + 500 watts RMS at 2 ohms Class D amplifier design with NextD switching amp technology differential balanced inputs help eliminate noise variable high pass filters (50 500 Hz, 12 dB octave) on front and rear channels variable low pass filter (50 500 Hz, 12 dB octave) on