B&C 8FMB51 8" Mid-Bass Speaker Woofer 500W, 8-Ohms, 67 Hz to 4500 Hz, 96.5 dB, Waterproof Impregnated Cone

B&C 8FMB51 8 Ω LF Drivers - 8" Woofer 250W to 500W Aluminium Sensitivity 96.5 dB

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

• Power Capacity: 500 W continuous program power capacity
• Voice Coil: 51 mm (2 in) aluminium voice coil
• Frequency Response: 67 - 4500 Hz
• Sensitivity: 96.5 dB
• Design: Ventilated voice coil gap for reduced power compression

Specifications

• Nominal Diameter: 200 mm (8.0 in)
• Impedance: 8 Ω
• Minimum Impedance: 5.5 Ω
• Power Handling: 250 W nominal, 500 W continuous
• Frequency Range: 67 - 4500 Hz
• Voice Coil Diameter: 51 mm (2.0 in)
• Winding Material: Aluminium
• Former Material: Glass Fibre
• Magnetic Gap Depth: 8.0 mm (0.31 in)
• Flux Density: 1.19 T

Parameters

• Resonance Frequency: 67 Hz
• Qes: 0.31
• Qms: 3.07
• Qts: 0.28
• Vas: 20.7 dm³ (0.73 ft³)
• Surface Area of Cone (Sd): 227.0 cm² (35.19 in²)
• Xmax: ± 5.5 mm
• Mms: 20.2 g
• Bl: 11.3 Txm
• Le: 0.48 mH
• EBP: 216 Hz

Design

• Surround Shape: Triple Roll
• Cone Shape: Curvilinear
• Magnet Material: Ferrite Ring
• Cone Treatment: Waterproof Impregnated Cone
• Recommended Enclosure: 14.0 dm³ (0.49 ft³)
• Tuning Frequency: 80 Hz

Mounting and Shipping Info

• Overall Diameter: 225 mm (8.86 in)
• Bolt Circle Diameter: 210 mm (8.27 in)
• Baffle Cutout Diameter: 187.0 mm (7.36 in)
• Depth: 92 mm (3.62 in)
• Net Weight: 3.4 kg (7.5 lb)
• Shipping Weight: 3.85 kg (8.49 lb)
• Shipping Box Dimensions: 255x255x150 mm (10.04x10.04x5.91 in)