Key Specifications/Special Features: ?Output power: 80W + 20W x 5 ?Frequency response: 50Hz-20kHz ?S/N: > = 82dB ?THD < = 0.3% ?Subwoofer : 8 ohm ; 8" ?Center : 8 ohm ; 3" x 2 ?Front Surround : 8 ohm ; (3"x2+1.5") x 2 ?Rear Surround : 8 ohm ; (3"x2+1.5") x 2 ?Power supply: AC220V/50Hz-60Hz