Cadence Acoustics XaH125.4 1000 Watt Peak 4-Channel Class AB Amplifier Cadence XaH125.4 class AB 4-channel amplifier 80W x 4 @ 4 ohm RMS, 125W x 4 @ 2 ohm RMS, 250W x 2 @ 4 ohm bridged RMS, 1000W Peak Power Frequency Response: 10Hz - 40 kHz Minimum THD: &lt;0.1%, S/N Ratio: &gt;97dB, Damping Factor: &gt;198 @ 100Hz, Channel Separation: &gt;50dB Dimension (L x W x H): 13.3 x 10.5 x 2.6 inches