Soundstream P4.500 500W 4-Channel Picasso Series Class A/B Amplifier Picasso Series 4-Channel Class A/B Car Amplifier RMS Power Rating: 4 ohms: 80 watts x 4 chan. / 2 ohms: 125 watts x 4 chan. / 4 ohm, Bridged: 250 watts x 2 chan. Max power output: 500 watts Pulse Width Modulated MOSFET power supply Heavy duty aluminum heat sink