B&C Speaker 12NDL76

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.3dB
• Frequency response 50 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50Hz
• Mechanical quality factor QMS 4.20
• Electrical quality factor QES 0.21
• Total quality factor QTS 0.20

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 365cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 1mH
• VC Diameter 76mm
• Winding height HVC 19mm
• Winding material Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 1.25T
• Force factor Bl 20.1N/A
• Motor constant Bl/√RE 8.73N/√W
• Air gap height HAG 10mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 258mm
• Effective area SD 522cm²
• Moving mass MMS 53g
• Moving mass (without air load) MMD 44.4g

Suspensions

• Stiffness KMS 5.03N/mm
• Compliance CMS 199µm/N
• Equivalent volume to the compliance VAS 73L
• Mechanical resistance RMS 3.96N·s/m

Dimensions

• Nominal diameter 12″
• 320mm
• Overall diameter 315mm
• Baffle cutout diameter 283mm
• Overall depth 141mm
• Flange thickness 14mm
• Mounting depth 127mm
• Volume occupied by the driver 2.5L
• Net weight 3.9kg