Soundstorm 1F850 850W Mono Mosfet Power Amplifier RMS Power at 4 Ohms: 500 W x 1RMS Power at 2 Ohms: 850 W x 1Peak Power at : 1200 W x 1 Freq Resp: 9 Hz50 Khz (+/- 3Db) 2? Stable Variable Low Pass Crossover: 40 Hz150 Hz Fixed High Pass Crossover: 200Hz