MD Lab SW-B12F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 42.8Hz
• Mechanical quality factor QMS 7.20
• Electrical quality factor QES 1.57
• Total quality factor QTS 1.29

Large signal parameters

• Power handling P 300W
• Program power Pmax 900W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz, estimated) LE 2.12mH

Magnet

• Force factor Bl 9.3N/A
• Motor constant Bl/√RE 5.04N/√W

Diaphragm

• Effective diameter 264mm
• Effective area SD 547cm²
• Moving mass MMS 150g
• Moving mass (without air load) MMD 141g

Suspensions

• Stiffness KMS 11.1N/mm
• Compliance CMS 90µm/N
• Equivalent volume to the compliance VAS 38.2L
• Mechanical resistance RMS 5.6N·s/m

Dimensions

• Nominal diameter 12″
• 310mm
• Overall diameter 310mm
• Baffle cutout diameter 286mm
• Overall depth 171mm
• Flange thickness 12mm
• Mounting depth 159mm
• Volume occupied by the driver (estimated) 3L