provided by Fabian aus dem Epicenter-Forum

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

Spectron SPA4100

1 × 57 watts, channel 1 at 4 Ohm
2 × 55 watts, channel 1 + 2 at 4 Ohm
4 × 49 watts, channel 1 up to 4 at 4 Ohm
Current consumption 24,5A
efficiency 59,3%

1 × 169 watts, channel 1 + 2 bridged at 4 Ohm
2 × 139 watts, channel 1 + 2 and 3 + 4 bridged at 4 Ohm
Current consumption 40,8A
efficiency 50,6%

278 watts total power