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

Spectron SP-M4150

1 × 91 watts, channel 1 at 4 Ohm
2 × 88 watts, channel 1 + 2 at 4 Ohm
4 × 81 watts, channel 1 up to 4 at 4 Ohm
Current consumption 38,8A
efficiency 61,9%

1 × 266 watts, channel 1 + 2 bridged at 4 Ohm
2 × 225 watts, channel 1 + 2 and 3 + 4 bridged at 4 Ohm with 13,4V supply voltage
Current consumption 65A
efficiency 51,7%

450 watts total power