Specifications Nominal diameter 250 mm (10.0 in) Nominal impedance 8 O Minimum impedance 6.4 O Nominal power handling1 250 W Continuous power handling2 500 W Sensitivity (1W/1m)3 98.0 dB Frequency range 65 - 3000 Hz Voice coil diameter 64 mm (2.5 in) Winding material Aluminium Former material Glass Fibre Winding depth 14 mm (0.55 in) Magnetic gap depth 8 mm (0.31 in)