Subwoofer: Drive Unit : 8 Inches Output Power:50W(RMS) Frequency:38Hz-250Hz Impedance:8 Ohms Sensitivity:85dB THD<0.1% Full Remote Control Satellite Speakers: Drive Unit: Front:2.75 inches *2 Center:2.75 inches *3 Surround:2.75 inches*2 Output Power: Front: 20W Center: 20W Surround: 20W Frequency:250Hz-20Khz Impedance:8Ohms Sensitivity:85dB