B&C Speaker 4NDF34

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.5dB
• Frequency response 110 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 110Hz
• Mechanical quality factor QMS 4.20
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 3.8mm
• Air volume displaced at xmax VD 22cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.23mH
• VC Diameter 34mm
• Winding height HVC 11mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.25T
• Force factor Bl 9N/A
• Motor constant Bl/√RE 3.84N/√W
• Air gap height HAG 7mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 6.1g
• Moving mass (without air load) MMD 5.7g
• Material Waterproof Both Sides

Suspensions

• Stiffness KMS 2.85N/mm
• Compliance CMS 351µm/N
• Equivalent volume to the compliance VAS 1.6L
• Mechanical resistance RMS 1N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall diameter 127mm
• Baffle cutout diameter 103mm
• Overall depth 66mm
• Flange thickness 3mm
• Mounting depth 63mm
• Volume occupied by the driver 0.25L
• Net weight 0.55kg