KICKER DX400.4 400W RMS 4-Channel DX Series Car Amplifier 50 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms) 200 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode) CEA-2006 compliant Variable high- and low-pass filters (50-200 Hz, 12 dB/octave) Variable bass boosts (0-12 dB at 40 Hz) on front and rear channels