5000 x 1 MAX @ 1 Ohm3500 x 1 RMS @ 1 Ohm2500 X 1 RMS @ 2 Ohms1800 x 1 RMS @ 4 Ohms4 x 40 AMP FUSES1 Ohm Stable Mono Block Class D ampRemote bass knob Bridgeable Subsonic and Low Pass Filters Variable Bass Boost Low Pass CrossoverDimensions (WxHxL) 10" x 2¼" x 18"