Nominal Diameter: 380/15 mm/inch Rated Impedance: 8 ohm Max Power: 3000 watts RMS Power: 1500 watts Sensitivity: 99 dB Frequency Range: 35-1500 Hz Effective Piston Diameter: 330/13 mm/inch Minimum Impedance: 5 ohm Voice Coil Diameter: 99.2/4 mm/inch Voice Coil Material: Copper Voice Coil Winding Depth: 25/1.0 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: triple roll