B&C Speaker 12BG100-4 12-inch Bass Woofer LF Drivers Pro Audio Component Speaker Driver for Motorcycle Car with 4 Ohms Impedance 1000 Watts Rms 2000 Watts Max Neodymium || Continuous power handling: 2000 W. * Voice coil diameter: 4.0 in (100 mm) * Magnet material: Neodymium Inside Slug. * Nominal Diameter: 320 mm (12.0 in). * Nominal Impedance: 4 Ohms. * Minimum Impedance: 5 Ohms. * Nominal Power Handling: 1000 W. * Continuous power handling: 2000 W. || * Sensitivity (1W/1m): 93.0 dB. * Frequency Range: 40 - 1000 Hz. * Voice Coil Diameter: 100 mm (4.0 in). * Winding Material: Copper. * Former Material: Glass Fibre. * Winding Depth: 27.0 mm (1.05 in). * Magnetic Gap Depth: 11.0 mm (0.43 in). * Flux Density: 1.15 TDesign. * Surround Shape: Roll. * Cone Shape: Radial. * Magnet Material: Neodymium Inside Slug. * Spider: Double Silicone. * Pole Design: T-Pole. || * Woofer Cone Treatment: TWP Waterproof Both Sides. * Recommended Enclosure: 40.0 dm3 (1.41 ft3). * Recommended Tuning: 40 Hz * Resonance Frequency: 39 Hz. || * Overall Diameter: 319 mm (12.5 in). * Bolt Circle Diameter: 299 mm (11.8 in). * Baffle Cutout Diameter: 281.0 mm (11.1 in). * Depth: 137 mm (5.4 in). * Flange and Gasket Thickness: 13 mm (0.5 in). * Air Volume Occupied by Driver: 2.7 dm3 (0.09 ft3). * Net Weight: 8.2 kg (18.0 lb). * Shipping Units: 1. * Shipping Weight: 9.1 kg (20.06 lb). * Shipping Box: 360x360x200 mm (14.17x14.17x7.87 in) * Recone kit: RCK12BG1008 || B&C Speakers has been one of largest and most prestigious professional loudspeaker transducer manufacturers in the world. In addition to designing and distributing components under the B&C brand name, they also supply OEM components to many of the top professional audio brands in the market today.