MD Lab SW-B12E

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 43.6Hz
• Mechanical quality factor QMS 6.54
• Electrical quality factor QES 0.73
• Total quality factor QTS 0.65

Large signal parameters

• Power handling P 200W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz, estimated) LE 2.24mH

Magnet

• Force factor Bl 14.5N/A
• Motor constant Bl/√RE 7.64N/√W

Diaphragm

• Effective diameter 252mm
• Effective area SD 498cm²
• Moving mass MMS 150g
• Moving mass (without air load) MMD 142g

Suspensions

• Stiffness KMS 11.1N/mm
• Compliance CMS 90µm/N
• Equivalent volume to the compliance VAS 31.6L
• Mechanical resistance RMS 6.5N·s/m

Dimensions

• Nominal diameter 12″
• 310mm
• Overall diameter 310mm
• Baffle cutout diameter 279mm
• Overall depth 150mm
• Flange thickness 12mm
• Mounting depth 138mm
• Volume occupied by the driver (estimated) 2.6L