Power rating 1350W rms Nominal impedance 8 Sensitivity 296 dB Frequency range 40-4000 Hz Voice coil diameter 75mm/3 in Chassis typecast Aluminum Magnet type Ferrite;Nominal diameter 305 mm/12 in;Magnet weight 2.3kg/81 oz. Coil material Round copper Former Glass material Fibercon material loaded paper with weather-resistant impregnation