Rockford Fosgate R400-4D 400W 4 Channel Car Audio Amplifier + 4 Gauge Amp Kit Rockford Fosgate R400 4D 400W 4 Channel Car Audio Amplifier RMS Power Rating: 75 Watts x 4 @ 4 Ohm 100 Watts x 4 @ 2 Ohm 200 Watts x 2 @ 4 Ohm Bridged