B&C Speaker 8BG51

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.6dB
• Frequency response 50 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 52Hz
• Mechanical quality factor QMS 12.30
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Air volume displaced at xmax VD 143cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 0.5mH
• VC Diameter 51mm
• Winding height HVC 17mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.15T
• Force factor Bl 11.8N/A
• Motor constant Bl/√RE 5.23N/√W
• Air gap height HAG 8mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 167mm
• Effective area SD 220cm²
• Moving mass MMS 35g
• Moving mass (without air load) MMD 32.5g
• Material Waterproof Front Side

Suspensions

• Stiffness KMS 3.75N/mm
• Compliance CMS 267µm/N
• Equivalent volume to the compliance VAS 18L
• Mechanical resistance RMS 0.93N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 225mm
• Baffle cutout diameter 187mm
• Overall depth 90mm
• Flange thickness 11mm
• Mounting depth 79mm
• Volume occupied by the driver 1.1L
• Net weight 1.85kg