B&C Speakers 12MH32-8 12-inch Woofer with 8 Ohms Impedance 400 Watts Rms 800 Watt Max Pro Audio Component Speaker Driver for Motorcycle Car || B & C Speakers 12MH32 12.0-in Woofer w/8 Ohms Impedance & 800 Watts Continuous Power Handling Capacity & Ferrite Magnet * Nominal Outer Diameter - mm (in): 320 (12.0) * Continuous Power Handing Capacity: 800 * Nominal power handling: 400 Watts * Frequency Response: 50 - 3000 Hz * Sensitivity (1W/1m): 101.0 dB * Nominal impedance: 8 Ohms * Minimum impedance: 6.5 Ohms * Winding material: Copper * Winding depth - mm (in): 14.0 (0.55) * Voice Coil Diameter - mm (in): 76 (3.0) * Cone Shape: Radial * Surround Shape: Double Roll * Former Material: Glass Fibre * Magnetic gap depth - mm (in): 8.0 (0.31) * Flux Density - T: 1.4 * Spider type: Single * Pole Design: T-Pole || SPECIFICATIONS || Nominal Diameter :: 320 mm (12.0 in) || Nominal Impedance :: 8 Ω || Minimum Impedance :: 6.5 Ω || Nominal Power Handling 1 :: 400 W|| Continuous power handling 2 :: 800 W || Sensitivity (1W/1m) 3 :: 101.0 dB || Frequency Range :: 50 - 3000 Hz || Voice Coil Diameter :: 76 mm (3.0 in) || Winding Material :: Copper || Former Material :: Glass Fibre || Winding Depth :: 14.0 mm (0.55 in) || Magnetic Gap Depth :: 8.0 mm (0.31 in) || Flux Density :: 1.4 T || DESIGN || Surround Shape :: Double Roll || Cone Shape :: Radial || Magnet Material :: Ferrite || Spider :: Single || Pole Design :: T-Pole || Woofer Cone Treatment :: None || PARAMETERS || Resonance Frequency :: 53 Hz || Re :: 5.2 Ω || Qes :: 0.2 || Qms :: 7.2 || Qts :: 0.19 || Vas :: 63.0 dm3 (2.2 ft3) || Sd :: 522.0 cm2 (80.9 in2) || η₀ :: 4.8 % || Xmax :: ± 5.0 mm || Xvar :: ± 7.0 mm || Mms :: 54.0 g || Bl :: 22.3 Txm || Le :: 0.83 mH || EBP :: 265 Hz || MOUNTING AND SHIPPING INFO || Overall Diameter :: 316 mm (12.4 in) || Bolt Circle Diameter :: 296 mm (11.6 in) || Baffle Cutout Diameter :: 282.0 mm (11.1 in) || Depth :: 133 mm (5.24 in) || Flange and Gasket Thickness :: 12 mm (0.47 in) || Air Volume Occupied by Driver :: 3.3 dm3 (0.12 ft3) || Net Weight :: 7.6 kg (16.7 lb) || Shipping Units :: 1 || Shipping Weight :: 8.5 kg (18.74 lb) || Shipping Box :: 360x360x200 mm (14.17x14.17x7.87 in)