Cadence Acoustics 850 Watt Peak Mono Block Class AB Amplifier (XaH400.1) Cadence XaH400.1 class AB mono block amplifier 300W @ 4 ohm RMS, 425W @ 2 ohm RMS, 850W Peak Power Frequency Response: 10Hz - 250Hz Minimum THD: &lt;0.1%, S/N Ratio: &gt;97dB, Damping Factor: &gt;160 @ 100Hz Dimension (L x W x H): 12.8 x 10.5 x 2.6 inches