provided by MuMpel from the Hififorum

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

Impulse SD-400

1 × 56 watts, channel 1 at 4 Ohm
2 × 50 watts, channel 1 + 2 at 4 Ohm
Current consumption 11,9A
efficiency 62,8%

1 × 149 watts, channel 1 + 2 bridged at 4 Ohm
Current consumption 20,3A
efficiency 54,3%

149 watts total power