Precision Power PPI S580.4 580W Max, Sedona Series 4-Channel Amplifier Sedona Series 4-Channel Class A/B Car Amplifier RMS Power Rating:4 ohms: 100 watts x 4 chan. 2 ohms: 145 watts x 4 chan. Bridged, 4 ohms: 290 watts x 2 chan. Brushed aluminum finish Turn on/off delay High and low inputs