Cadence XAM500.4 1000W 4-Channel Xenith XAM Series Class D Full Range Amplifier 1000W 4-Channel Xenith (XAM) Series Class D Full Range Amplifier RMS Power Rating: 4 ohms: 90 watts x 4 chan. / 2 ohms: 125 watts x 4 chan. / Bridged, 4 ohms: 250 watts x 2 chan. Max power output: 1000 watts Minimum THD: &lt; 0.1% Frequency Response: 10Hz - 40,000Hz