DC-51 5.1 Channel Home Theatre AM/FM 2-band radio Auto scan receiver Auto-store broadcasting station Full Remote control Subwoofer: Drive Unit: 6.5inches x 2 Output power:50w Frequency:38Hz-250Hz Impedance: 8Ω Sensitivity: 85dB THD<0.1% Speaker Front: 4inch + 2inch Center: 4inch x 2+ 2inch Surrond: 4inch + 2inch Output power: Front:20w; Center: 20w; Surrond: 20w Frequency:250Hz-20kHz Impedance: 8Ω Sensitivity: 85dB