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8FMB51

8FMB51

LF Drivers 8.0 inches

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Datasheet
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12_33_13_855_8fmb51rear12_33_13_840_8fmb51front12_33_13_741_8fmb51rear_b
Continuous power handling
Voice coil diameter
Magnet material
The FMB series mid-bass woofers from B&C Speakers offer 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.
 
 
 
 

Features

  • 500 W continuous program power capacity
  • 51 mm (2 in) aluminium voice coil
  • 67 - 4500 Hz response
  • 96.5 dB sensitivity
  • Ventilated voice coil gap for reduced power compression

Specifications

  • Nominal Diameter200 mm (8.0 in)
  • Nominal Impedance8 Ω
  • Minimum Impedance5.5 Ω
  • Nominal Power Handling1250 W
  • Continuous power handling2500 W
  • Sensitivity (1W/1m)396.5 dB
  • Frequency Range67 - 4500 Hz
  • Voice Coil Diameter51 mm (2.0 in)
  • Winding MaterialAluminium
  • Former MaterialGlass Fibre
  • Winding Depth15.0 mm (0.59 in)
  • Magnetic Gap Depth8.0 mm (0.31 in)
  • Flux Density1.19 T

Design

  • Surround ShapeTriple Roll
  • Cone ShapeCurvilinear
  • Magnet MaterialFerrite Ring
  • SpiderSingle
  • Pole DesignT-Pole
  • Woofer Cone TreatmentWaterproof Impregnated Cone
  • Recommended Enclosure14.0 dm3 (0.49 ft3)
  • Recommended Tuning80 Hz

Parameters4

  • Resonance Frequency67 Hz
  • Re4.7 Ω
  • Qes0.31
  • Qms3.07
  • Qts0.28
  • Vas20.7 dm3 (0.73 ft3)
  • Sd227.0 cm2 (35.19 in2)
  • η₀1.91 %
  • Xmax± 5.5 mm
  • Xvar± 5.0 mm
  • Mms20.2 g
  • Bl11.3 Txm
  • Le0.48 mH
  • EBP216 Hz

Mounting and Shipping Info

  • Overall Diameter225 mm (8.86 in)
  • Bolt Circle Diameter210 mm (8.27 in)
  • Baffle Cutout Diameter187.0 mm (7.36 in)
  • Depth92 mm (3.62 in)
  • Flange and Gasket Thickness9 mm (0.35 in)
  • Air Volume Occupied by Driver1.2 dm3 (0.04 ft3)
  • Net Weight3.4 kg (7.5 lb)
  • Shipping Units1
  • Shipping Weight3.85 kg (8.49 lb)
  • Shipping Box255x255x150 mm (10.04x10.04x5.91 in)
  • 2 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated minumum impedance. Loudspeaker in free air.
  • Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
  • Applied RMS Voltage is set to 2.83 V for 8 ohms Nominal Impedance.
  • Thiele-Small parameters are measured after a high level 20 Hz sine wave preconditioning test.