Precision Power i320.4 PPI iON Series 320 Watts Class D 4-Channel Amplifier RMS Power Rating: 4 ohms: 60 watts x 2 chan./2 ohms: 80 watts x 2 chan./Bridged, 4 ohms: 160 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) Balanced signal input