B&C Speakers 12FW76-8 12-inch Woofer with 8 Ohms Impedance 500 Watts Rms 1000 Watts Max Pro Audio Component Speaker Driver for Motorcycle Car || Nominal Outer Diameter - mm (in): 320 (12.0) * Continuous Power Handing Capacity: 1000 * Nominal power handling: 500 Watts * Frequency Response: 55 - 3000 Hz * Sensitivity (1W/1m): 100.0 dB * Nominal impedance: 8 Ohms * Minimum impedance: 6.8 Ohms * Winding material: Copper * Winding depth - mm (in): 19.0 (0.75) * Voice Coil Diameter - mm (in): 76 (3.0) * Cone Shape: Exponential * Surround Shape: Triple Roll * Former Material: Glass Fibre * Magnetic gap depth - mm (in): 11.0 (0.43) * Flux Density - T: 1.35 * Spider type: Single * Pole Design: T-Pole Recommended Enclosure: 40.0 (1.41) Recommended Tuning in Hz: 65 || SPECIFICATIONS || Nominal Diameter :: 320 mm (12.0 in) || Nominal Impedance :: 8 Ω || Minimum Impedance :: 6.8 Ω || Nominal Power Handling 1 :: 500 W || Continuous power handling 2 :: 1000 W || Sensitivity (1W/1m) 3 :: 100.0 dB || Frequency Range :: 55 - 3000 Hz || Voice Coil Diameter :: 76 mm (3.0 in) || Winding Material :: Copper || Former Material :: Glass Fibre || Winding Depth :: 19.0 mm (0.75 in) || Magnetic Gap Depth :: 11.0 mm (0.43 in) || Flux Density :: 1.35 T || DESIGN || Surround Shape :: Triple Roll || Cone Shape :: Exponential || Magnet Material :: Ferrite || Spider :: Single || Pole Design :: T-Pole || Woofer Cone Treatment :: WP Waterproof Front Side || Recommended Enclosure :: 40.0 dm3 (1.41 ft3) || Recommended Tuning :: 65 Hz || PARAMETERS || Resonance Frequency :: 54 Hz || Re :: 5.1 Ω || Qes :: 0.18 || Qms :: 3.8 || Qts :: 0.18 || Vas :: 45.0 dm3 (1.6 ft3) || Sd :: 522.0 cm2 (80.9 in2) || η₀ :: 3.7 % || Xmax :: ± 7.0 mm || Xvar :: ± 10.0 mm || Mms :: 75.0 g || Bl :: 26.4 Txm || Le :: 1.4 mH || EBP :: 300 Hz || MOUNTING AND SHIPPING INFO || Overall Diameter :: 315 mm (12.4 in) || Bolt Circle Diameter :: 298 mm (11.7 in) || Baffle Cutout Diameter :: 283.0 mm (11.1 in) || Depth :: 147 mm (5.79 in) || Flange and Gasket Thickness :: 12 mm (0.47 in) || Air Volume Occupied by Driver :: 3.0 dm3 (0.1 ft3) || Net Weight :: 8.5 kg (18.7 lb) || Shipping Units :: 1 || Shipping Weight :: 9.4 kg (20.72 lb) || Shipping Box :: 360x360x200 mm (14.17x14.17x7.87 in)