provided by gisewhcs from the Hififorum

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

NXS NA-2120

1 × 75 watts, channel 1 at 4 Ohm
2 × 71 watts, channel 1 + 2 at 4 Ohm
Current consumption 15,2A
efficiency 68,8%

1 × 231 watts, channel 1 + 2 bridged at 4 Ohm
Current consumption 28,1A
efficiency 60,9%

Increase the fuse from 15A to 25A necessary

231 watts total power