Nominal Diameter: 300/12 mm/inch Rated Impedance: 8 ohm Max Power: 1500 watts RMS Power: 750 watts Sensitivity: 97 dB Frequency Range: 50-2000 Hz Effective Piston Diameter: 282/11.1 mm/inch Minimum Impedance: 5 ohm Voice Coil Diameter: 99.2/4 mm/inch Voice Coil Material: Copper Voice Coil Winding Depth: 20/0.8 mm/inch Number of layers: 2 Kind of layer: outside Top Plate Thickness: 15/0.55 mm/inch Cone Material: no pressed pulp Cone Design: curved Surround Material: polycotton Surround Design: m-roll