B&C Speaker 12MH32

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.4dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 53Hz
• Mechanical quality factor QMS 7.20
• Electrical quality factor QES 0.20
• Total quality factor QTS 0.19

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 261cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 0.83mH
• VC Diameter 76mm
• Winding height HVC 14mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.4T
• Force factor Bl 22.3N/A
• Motor constant Bl/√RE 9.78N/√W
• Air gap height HAG 8mm
• Material Ferrite

Diaphragm

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

Suspensions

• Stiffness KMS 6.37N/mm
• Compliance CMS 157µm/N
• Equivalent volume to the compliance VAS 63L
• Mechanical resistance RMS 2.5N·s/m

Dimensions

• Nominal diameter 12″
• 320mm
• Overall diameter 316mm
• Baffle cutout diameter 282mm
• Overall depth 133mm
• Flange thickness 12mm
• Mounting depth 121mm
• Volume occupied by the driver 3.3L
• Net weight 7.5kg