B&C Speaker 12NDL88

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.3dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 48Hz
• Mechanical quality factor QMS 6.80
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

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 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.9mH
• VC Diameter 88mm
• Winding height HVC 21.5mm
• Winding material Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 1.05T
• Force factor Bl 16.6N/A
• Motor constant Bl/√RE 9.43N/√W
• Air gap height HAG 10mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 258mm
• Effective area SD 522cm²
• Moving mass MMS 73.6g
• Moving mass (without air load) MMD 65g
• Material Waterproof Front Side

Suspensions

• Stiffness KMS 6.71N/mm
• Compliance CMS 149µm/N
• Equivalent volume to the compliance VAS 57L
• Mechanical resistance RMS 3.26N·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