B&C Speaker 4NDS34

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.9dB
• Frequency response 80 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 79Hz
• Mechanical quality factor QMS 8.50
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

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 0.21mH
• VC Diameter 34mm
• Winding height HVC 11mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.25T
• Force factor Bl 8.8N/A
• Motor constant Bl/√RE 3.75N/√W
• Air gap height HAG 7mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 7.2g
• Moving mass (without air load) MMD 6.8g
• Material Waterproof Both Sides

Suspensions

• Stiffness KMS 1.75N/mm
• Compliance CMS 572µm/N
• Equivalent volume to the compliance VAS 2.6L
• Mechanical resistance RMS 0.42N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall diameter 127mm
• Baffle cutout diameter 103mm
• Overall depth 67mm
• Flange thickness 3mm
• Mounting depth 64mm
• Volume occupied by the driver 0.25L
• Net weight 0.55kg