Kenwood eXcelon KAC-X40 - Amplifier - 4-channel 4-channel car amplifier 70 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms) 200 watts RMS x 2 bridged output at 4 ohms (4 ohm stable in bridged mode) K-STAT transistors with instantaneous temperature control variable high-pass filters (40-200 Hz, -12 dB/octave) on front and rear channels