B&C 8FMB51 8-Inch Speaker Driver - 250W RMS, 8 Ohm

The B&C 8FMB51 8-Inch Speaker Driver offers acoustic designers a new range of high efficiency, wide bandwidth alternatives that are not currently available in the B&C range. These full-featured transducers incorporate lower cost ferrite motors, inside/outside wound copper clad aluminum wire voice coils, weatherproof impregnated paper cones, and a symmetrical inductance profile. The FMB Series is especially well suited for two-way loudspeaker enclosures.

B&C 8FMB51 8-Inch Speaker Driver Features

- 500 W continuous program power capacity
- 51 mm (2 inch) aluminium voice coil
- 67 - 4500 Hz response
- 96.5 dB sensitivity
- Waterproofed cone
- Ventilated voice coil gap for reduced power consumption

B&C 8FMB51 8-Inch Speaker Driver Specifications

- Nominal Basket Diameter: 200 mm (8 inches)
- Nominal Impedance: 8 Ω
- Minimum Impedance: 5.5 Ω
- Nominal Power Handling: 250 W
- Continuous Power Handling: 500 W
- Frequency Response: 67 - 4500 Hz
- Sensitivity (1W/1m): 96.5 dB
- Voice Coil Diameter: 51 mm (2.0 inches)
- Winding Material: Aluminium
- Former Material: Glass Fibre
- Winding Depth: 15 mm (0.59 inches)
- Magnetic Gap Depth: 8.0 mm (0.31 inches)
- Flux Density: 1.19 T
- Connection: Spade Terminals

Design:
- Surround shape: Triple Roll
- Cone shape: Curvilinear
- Magnet material: Ferrite Ring
- Spider: Single
- Pole design: T-Pole
- Woofer cone treatment: WP Waterproof Front Side
- Recommended enclosure: 14.0 dm³ (0.49 ft³)
- Recommended tuning: 80 Hz

Parameters:
- Fs: 67 Hz
- Re: 4.7 Ω
- Qes: 0.31
- Qms: 3.07
- Qts: 0.28
- Vas: 20.7 dm³
- Sd: 220.7 cm²
- η₀: 1.91 %
- Xmax: ± 5.5 mm
- Xvar: ± 5.0 mm
- Mms: 20.2 g
- Bl: 11.3 Txm
- Le: 0.48 mH
- EBP: 216 Hz

Physical:
- Overall diameter: 225 mm (8.86 inches)
- Bolt circle diameter: 210 mm (8.27 inches)
- Baffle cutout diameter: 187 mm (7.36 inches)
- Depth: 92 mm (3.62 inches)
- Flange and gasket thickness: 9 mm (0.35 inches)
- Air volume occupied by driver: 1.2 dm³
- Net weight: 4.0 kg