Nominal Diameter: 460/18 mm/inch Rated Impedance: 8 ohm Max Power: 2400 watts RMS Power: 1200 watts Sensitivity: 98 dB Frequency Range: 32-1000 Hz Effective Piston Diameter: 395/15.6 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: straight Surround Material: polycotton Surround Design: triple roll