Key Specifications/Special Features: ?Output power: 20W + 5W x 5 ?P.M.P.O.: > = 3000W ?Frequency response : 50Hz-20kHz ?S/N: > = 80dB ?THD < = 0.3% ?Subwoofer : 4 ohm ; 4" ?Center : 4 ohm ; 3" ?Front Surround : 4 ohm ; 3" x 2 ?Rear Surround : 4 ohm ; 3" x 2 ?Power supply: AC220V/50Hz-60Hz ?Packing size: 333 x 370 x 297mm