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

Sony XM-5540F

1 × 81 Watts channel 1 at 4 Ohm
2 × 73 Watts channel 1 + 2 at 4 Ohm
4 × 60 Watts channel 1 up to 4 at 4 Ohm

1 × 159 Watts channel 1 + 2 bridged at 4 Ohm
2 × 137 Watts channel 1 + 2 and 3 + 4 bridged at 4 Ohm

274 watts total power

Sony XM-5540F

1 × 94 watts, channel 1 at 4 Ohm
2 × 86 watts, channel 1 + 2 at 4 Ohm
4 × 68 watts, channel 1 up to 4 at 4 Ohm with 13,7V supply voltage
Current consumption 36,3A
efficiency 54,7%

1 × 196 watts, channel 1 + 2 bridged at 4 Ohm
2 × 169 watts, channel 1 + 2 and 3 + 4 bridged at 4 Ohm with 13,7V supply voltage
Current consumption 56A
efficiency 44,1%

338 watts total power