Nominal Diameter: 460/18 mm/inch Rated Impedance: 8 ohm Max Power: 1600 watts RMS Power: 800 watts Sensitivity: 99 dB Frequency Range: 45-2000 Hz Effective Piston Diameter: 405/16 mm/inch Minimum Impedance: 5.5 ohm Voice Coil Diameter: 99.2/4 mm/inch Voice Coil Material: Copper Voice Coil Winding Depth: 24/1.0 mm/inch Number of layers: 2 Kind of layer: outside Top Plate Thickness: 14/0.55 mm/inch Cone Material: no pressed pulp Cone Design: straight Surround Material: polycotton Surround Design: triple roll