Soundstream PN5.640D Picasso Nano 640 W 5-Channel Class D digital Car Audio Amplifier PN5.640D - Soundstream 5-Channel 640W RMS Picasso Nano Series Class D Amplifier RMS Power Rating: 4 ohms: 60 watts x 4 chan. + 200 watts | 2 ohms: 80 watts x 4 chan. + 350 watts | 4 ohms Bridged: 160 watts x 2 chan. + 350 watts Full MOSFET PWM Power Supply SMD Technology on Double Sided PCB Dimensions: 4.75"W x 1.5"H x 10.3" L