Rated power measured according to DIN 45500 up to 1% distortion factor in 13,5V

Sony XM-2100G

1 × 132 watts, channel 1 at 4 Ohm
2 × 130 watts, channel 1 + 2 at 4 Ohm
Current consumption 27,3A
efficiency 70,5%

1 × 408 watts, channel 1 + 2 bridged at 4 Ohm
Current consumption 48,5A
efficiency 62,3%

1 × 551 watts, channel 1 + 2 bridged at 2 Ohm with 13,4V supply voltage
Current consumption 77,5A
efficiency 53,1%

551 watts total power