Cadence Acoustics Xa125.4B 1000 Watt Peak 4-Channel Class AB Amplifier (Black) Cadence Xa125.4B 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 Xenith Power Frequency Response: 10Hz - 40 kHz Minimum THD: 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