General Specifications Nominal diameter 381mm / 15in Power rating 800watt-1800watt Nominal impedance 8 0hm Sensitivity 96dB Frequency range 40-3500HZ Chassis type Cast aluminum Magnets type Ferrite Magnet size 220x110x25mm Magnet weight 3.49kg / 123.1oz Voice coil diameter 99.5mm / 4in Coil material CCA -W Number of layers 2 (Outside) Former material Glass Fiber Cone Material Paper Surround material Spider Single X-max 7mm / 0.27in Gap depth of 10 mm / 0.39in Voice coil winding width 22 mm / 0.86in Net Weight: 11.1kg / pcs Gross Weight: 12.3kg / pcs Packing Size: 410*410*195cm / pcs