• General Specifications Nominal diameter 381mm / 15in Power rating 800watt-1800watt Nominal impedance 8 0 Sensitivity 96dB Frequency range 35-3500HZ Chassis type Cast aluminum Magnets type Ferrite Magnet size 220x110x20mm Magnet weight 2.8kg / 98.5oz Voice coil diameter 99.5mm / 4in Coil material CCA -W Number of layers 2 (Outside) Former material Glass Fiber Cone Material Paper Surround