B&C Speaker 12NDL76

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.6dB
• Frequency response 50 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50Hz
• Mechanical quality factor QMS 3.25
• Electrical quality factor QES 0.20
• Total quality factor QTS 0.19

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 313cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.72mH
• VC Diameter 76mm
• Winding height HVC 18.5mm
• Winding material Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 1.25T
• Force factor Bl 16.5N/A
• Motor constant Bl/√RE 9.37N/√W
• Air gap height HAG 10mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 258mm
• Effective area SD 522cm²
• Moving mass MMS 54g
• Moving mass (without air load) MMD 45.4g

Suspensions

• Stiffness KMS 5.53N/mm
• Compliance CMS 181µm/N
• Equivalent volume to the compliance VAS 70L
• Mechanical resistance RMS 5.22N·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