Precision Power i640.5 640-Watt 5-Channel iON Series Class D Full-Range Digital Stereo Bridgeable Amplifier RMS Power Rating: 4 ohms: 60 watts x 4 chan./2 ohms: 80 watts x 4 chan. Subwoofer Channel RMS Power Rating: 4 ohms: 200 watts x 1 chan./2 ohms: 350 watts x 1 chan. Pulse Width Modulated MOSFET power supply LED power (green) and protect (red) indicators 3-way protection circuitry (thermal, overload, and speaker short protection)