Woof: 6 inches 25W Mediant: 1.5 inches 8W Alt: 3.5 inches 15W Output power: 20W*2 Output impedance:4 ohms Input sensitivity: 480mW SNR : 60dB Frequency response subwoofer: 40Hz-15KHz Separate degree:45dB Power supply voltage: alternating current voltage 220V/50Hz if you have any interest,please send me a email: I look forward to receiving your reply.