B&C Speaker 8FCX51

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.3dB
• Frequency response 70 - 18000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 69Hz
• Mechanical quality factor QMS 6.30
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 132cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 0.9mH
• VC Diameter 51mm
• Winding height HVC 17.5mm
• Winding material Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 1T
• Force factor Bl 11.5N/A
• Motor constant Bl/√RE 5.2N/√W
• Air gap height HAG 8mm
• Material Ferrite

Diaphragm

• Effective diameter 167mm
• Effective area SD 220cm²
• Moving mass MMS 22g
• Moving mass (without air load) MMD 19.5g
• Material Waterproof Front Side

Suspensions

• Stiffness KMS 4.22N/mm
• Compliance CMS 237µm/N
• Equivalent volume to the compliance VAS 16L
• Mechanical resistance RMS 1.51N·s/m

Dimensions

• Nominal diameter 8″
• 210mm
• Overall diameter 225mm
• Baffle cutout diameter 187mm
• Overall depth 118mm
• Flange thickness 10mm
• Mounting depth 108mm
• Volume occupied by the driver (estimated) 1.7L
• Net weight 5.0kg