Nominal Diameter: 250/10 mm/inch Rated Impedance: 8 ohm Max Power: 700 watts RMS Power: 350 watts Sensitivity: 98 dB Frequency Range: 80-4000 Hz Effective Piston Diameter: 230/8.8 mm/inch Minimum Impedance: 7.2 ohm Voice Coil Diameter: 75.5/3 mm/inch Voice Coil Material: Aluminium Voice Coil Winding Depth: / Number of layers: 2 Kind of layer: outside Top Plate Thickness: 12/0.47 mm/inch Cone Material: no pressed pul Cone Design: curved Surround Material: polycotton Surround Design: m-roll