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

Fosi Audio CA30 

1 × 108 watts, channel 1 at 4 Ohm
2 × 100 watts, channel 1 + 2 at 4 Ohm
4 × 90 watts, channel 1 up to 4 at 4 Ohm with 13,7V supply voltage
Current consumption 32,2A
efficiency 81,8%

1 × 324 watts, channel 1 + 2 bridged at 4 Ohm
2 × 272 watts, channel 1 + 2 and 3 + 4 bridged at 4 Ohm with 13,6V supply voltage
Current consumption 49,8A
efficiency 80,40%

544 watts total power