US Acoustics Mike 1500 RMS at 1 Ohm Class D Mono Subwoofer Amplifier RMS per channel at 4 Ohms 375 x 1 CH RMS per channel at 2 Ohms 750 x 1 CH RMS Mono at 1 Ohm 1500 x 1 CH Low Pass, 24dB/Octave 10Hz - 150Hz FREQUENCY RESPONSE 10Hz - 150Hz +/- 0.5dB