Cadence Acoustics XAH125.4B Class AB 4-Channel 1000 Watt Amplifier 4 Ohm RMS Power: 80W x 4|2 Ohm RMS Power: 125W x 4 4 Ohm Bridged RMS Power: 250W x 2|Peak Power: 1000 Watts Minimum THD: &lt;0.1%|Frequency Response: 10Hz - 40 kHz|S/N Ratio: &gt;97dB Damping Factor: &gt;198 @ 100Hz|Channel Separation: &gt;50dB Input Voltage: 200mV - 8V|Dimensions (L x W x H): 13.3" x 10.5" x 2.6"