Soundstream PN4.1000D 1000W 4-Channel Picasso Nano Series Class D Amplifier Picasso Nano Series 4-Channel Class D Car Amplifier RMS Power Rating: 4 ohms: 140 watts x 4 chan. / 2 ohms: 250 watts x 4 chan. Max power output: 500 watts 3-way protection circuitry (thermal, overload, and speaker short protection) Pulse Width Modulated MOSFET power supply.200mv-6V Low Level Input Sensitivity