MB Quart 640 Watt 4 Channel Amplifier Car Audio Stereo Power Amp | ZA1-640.4 MB Quart Z-Line ZA1-640.4 4 Channel Amplifier Power Handling Power @ 2 Ohms: 160 Watts x 4 Power @ 4 Ohms: 80 Watts x 4 Bridged @ 4 Ohms: 320 Watts x 2