Kenwood KAC-9106D Mono subwoofer amplifier Features: 500 watts RMS x 1 at 4 ohms (1,000 watts x 1 at 2 ohms) variable low-pass filter (50-200 Hz at 24 dB per octave) speaker-level inputs with signal sensing turn-on 4-gauge power and ground leads recommended Class D amp design Type: Amplifiers