Kenwood XR600-1 eXceleon Reference Fit Mono Digital Power Amplifier RMS Power: 400W x 1 @ 4 ohms, 600W x 1 @ 2 ohms Variable Low-Pass Filter (50-200 Hz, 24 dB/octave) CEA-2006 Compliant Dimensions: 8-11/16"W x 1-7/16"L x 8"H