Soundstream PN5.640D 640W 5-Channel Picasso Nano Class-D Amplifier Picasso Nano Series 5-Channel Class D Car Amplifier RMS Power Rating: 4 ohms: 60 watts x 4 chan. + 200 Watts / 2 ohms: 80 watts x 4 chan. + 350 Watts Max power output: 640 watts Variable Bass Boost (0 to +12 dB bass boost at 45 Hz) & Variable low-pass filter (50-250 Hz, 24 dB/octave) Pulse Width Modulated MOSFET power supply