Specification: Model No:TD-750SThroat Diameter: 50.8/2 mm/inch Rated impedance: 8 ohn Power handing capacity continuous program above 1.2KHz: 220 Watt AES above 1kHz: 110 Watt Sensitivity: 107.5 dB Frequency Range: 50-2000 Hz Minimum Impedance: 8.8ohm at 3500Hz Voice Coil Diameter: 75/3 mm/inch Overall Diameter: 180/.1 mm/inch Overall Height: 87/3.4 mm/inch Net weight: 6.3/13.9 kg/Lbs