B&C Speaker 12NDL88

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.1dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 51Hz
• Mechanical quality factor QMS 5.00
• Electrical quality factor QES 0.29
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 418cm³
• Power handling P 700W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 1.3mH
• VC Diameter 88mm
• Winding height HVC 21mm
• Winding material Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 1.05T
• Force factor Bl 19.9N/A
• Motor constant Bl/√RE 8.9N/√W
• Air gap height HAG 10mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 258mm
• Effective area SD 522cm²
• Moving mass MMS 71g
• Moving mass (without air load) MMD 62.4g
• Material Waterproof Front Side

Suspensions

• Stiffness KMS 7.35N/mm
• Compliance CMS 136µm/N
• Equivalent volume to the compliance VAS 52L
• Mechanical resistance RMS 4.55N·s/m
• Spider material Silicone

Dimensions

• Nominal diameter 12″
• 320mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 140mm
• Flange thickness 13mm
• Mounting depth 127mm
• Volume occupied by the driver 2.5L
• Net weight 4.95kg