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

Alpine MRP-F257

1 × 37 watts, channel 1 at 4 Ohm
2 × 35 watts, channel 1 + 2 at 4 Ohm
4 × 32 watts, channel 1 up to 4 at 4 Ohm

4 × 24 watts, channel 1 up to 4 at 4 Ohm +
1 × 86 Watts channel 5 at 4 Ohm
Current consumption 27,7A
efficiency 48,8%

measured with 200 Hz because of fixed preset low-pass filter with channel 5