Kenwood eXcelon X500-1 1000 Watts Class D Amplifier 300 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms) Variable Low Pass Filter (50-200[Hz],24dB/oct) BASS BOOST 40Hz+18dB Class-D Mono Power Amplifier Dimensions (WxHxD): 9"x 2-3/16"x 8-3/8"