Subwoofer: Drive Unit : 8 Inches Output Power:60W(RMS) Frequency:38Hz-250Hz Impedance:8 Ohms Sensitivity:85dB THD<0.1% Satellite Speakers: Drive Unit: Front:2.75 inches *2 Center:2.75 inches *3 Surround:2.75 inches*2 Output Power:20W(RMS)*5 Frequency:250Hz-20Khz Impedance:8Ohms Sensitivity:85dB Satellite Speakers made of Plastic