Dimensions: H: 53" (134 cm) D: 21" (53 cm) W: 18" (45 cm) Weight: 360 lbs (165 Kg). Driver Complement: 1" Mr_1 Ring Radiator tweeter 2 X 6" Nano-Tec woofers 2 X 9" Nano-Tec woofers Sensitivity: 89 db Impedance: 4 ohms Frequency Response: 22Hz-40KHz Recommended Power: 50-1000 Watts