Cadence Acoustics CSA1000.4 1200 Watt Peak 4-Channel Class AB Amplifier Cadence Momentum Series CSA1000.4 class AB 4-channel amplifier 150W x 4 at 4 ohm RMS, 300W x 4 at 2 ohm RMS, 1200W Peak Power Frequency Response: 20Hz - 20 kHz THD: &lt;0.01%; S/N Ratio: &gt;96dB; Input Voltage: 200mV-8V Dimensions (L x W x H): 10.7 x 8 x 2 inches