Nominal Diameter: 250/10 mm/inch Rated Impedance: 8 ohm Max Power: 1200 watts RMS Power: 600 watts Sensitivity: 96 dB Frequency Range: 65-3000 Hz Effective Piston Diameter: 230/8.8 mm/inch Minimum Impedance: 5 ohm Voice Coil Diameter: 75.5/3 mm/inch Voice Coil Material: Copper Voice Coil Winding Depth: 15/0.8 mm/inch Number of layers: 2 Kind of layer: outside Top Plate Thickness: 12/0.59 mm/inch Cone Material: no pressed pulp Cone Design: curved Surround Material: polycotton Surround Design: m-roll