Circuit Topology FULL RANGE CLASSS DRMS POWER OUTPUT 2 OHM 450W X 4CHRMS POWER OUTPUT 4 OHM 300W X 4CHRMS POWER OUTPUT 4 OHM BRIDGED 900W X 2CHTOTAL HARMONIC DISTORTION <0.3%S/N RATIO REF 1W AT 4 OHM >90 dBGAIN RANGE 0.2-6VCROSSOVER RANGE 40-4KHzFREQUENCY RANGE 20-20KHZ..