Soundstream PN4.320D 320W 4-Channel Picasso Nano Class-D Amplifier Picasso Nano Series 4-Channel Class D Car Amplifier RMS Power Rating: 4 ohms: 60 watts x 4 chan. / 2 ohms: 80 watts x 4 chan. Max power output: 320 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