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

Sony XM-260G

1 × 79 watts, channel 1 at 4 Ohm
2 × 78 watts, channel 1 + 2 at 4 Ohm
Current consumption 16,3A
efficiency 71,2%

1 × 266 watts, channel 1 + 2 bridged at 4 Ohm
Current consumption 29,6A
efficiency 66,5%

1 × 398 watts, channel 1 + 2 bridged at 2 Ohm
Current consumption 51A
efficiency 57,8%

398 watts total power