8″ B&C FCX51

General

Nominal Diameter: 210 mm (8 in)
Nominal Impedance: 8 Ω
Frequency Range: 70 Hz – 18000 Hz
Dispersion Angle: 100 °

Specifications LF Unit

Nominal Diameter: 210 mm (8 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 6 Ω
Nominal Power Handling: 250 W
Continuous Power Handling: 500 W
Sensitivity: 96 dB
Voice Coil Diameter: 51 mm (2 in)
Winding Material: Aluminium
Former Material: Glass Fibre
Winding Depth: 17.5 mm (0.69 in)
Magnetic Gap Depth: 8 mm (0.31 in)
Flux Density: 1 T
Woofer Cone Treatment: WP Waterproof Front Side

Specifications HF Unit

Nominal Diameter: 210 mm (8 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 7 Ω
Nominal Power Handling: 50 W
Continuous Power Handling: 100 W
Sensitivity: 104 dB
Recommended Crossover: 1.8 kHz
Voice Coil Diameter: 44 mm (1.7 in)
Winding Material: Aluminium
Inductance: 0.11 mH
Flux Density: 1.8 T
Diaphragm Material: Polyimide

Design

Magnet Material: Ferrite
Woofer Cone Treatment: WP Waterproof Front Side

Parameters

Fs: 69 Hz
Re: 4.9 Ω
Qes: 0.36
Qms: 6.3
Qts: 0.34
Vas: 16 dm³ (0.56 ft³)
Sd: 220 cm² (34.1 in²)
η₀: 1.4 %
Xvar: 6 mm
Mms: 22 g
Bl: 11.5 Tm
Le: 0.9 mH
EBP: 192 Hz

Mounting and Shipping Info

Overall Diameter: 225 mm (8.8 in)
Bolt Circle Diameter: 210 mm (8.3 in)
Baffle Cutout Diameter: 187 mm (7.4 in)
Depth: 118 mm (4.64 in)
Flange and Gasket Thickness: 10 mm (0.37 in)
Net Weight: 5 kg (11.02 lb)
Shipping Units: 1 pcs
Shipping Weight: 5.6 kg (12.35 lb)
Shipping Box: 295x314x175 mm (11.61×12.36×6.89 in)

Service Kit

hf Replacement Diaphragm: MMD4008
lf Recone Kit: RCK008FCX518
Cone
Gasket
Centering Shims

Specification PDF