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

Macrom SynTech ST2.100x

1 × 121 watts, channel 1 at 4 Ohm
2 × 121 watts, channel 1 + 2 at 4 Ohm
Current consumption 29,2A
efficiency 61,4%

1 × 454 watts, channel 1 + 2 bridged at 4 Ohm with 13,3V supply voltage
Current consumption 61A
efficiency 55,1%

454 watts total power