Woofer: Output power (RMS): 30W Frequency response: 20HZ~150HZ Total harmonic distortion: ' 0.8 % '@ 1W,100HZ SN Ratio: 65DB Speaker unit: 4" Secondary: Output power (RMS): 15W Frequency response: 150HZ~20KHZ Total harmonic distortion: 0.5% @ 1W,1KHZ SN Ratio: 70DSpeaker unit: 3"