MD Lab SW-A12

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 31.3Hz
• Mechanical quality factor QMS 2.13
• Electrical quality factor QES 0.58
• Total quality factor QTS 0.46

Large signal parameters

• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 7.2Ω
• Inductance (1kHz, in series, estimated) LE 6.18mH

Magnet

• Force factor (in series) Bl 24.4N/A
• Motor constant Bl/√RE 9.09N/√W

Diaphragm

• Effective diameter 270mm
• Effective area SD 574cm²
• Moving mass MMS 243g
• Moving mass (without air load) MMD 233g

Suspensions

• Stiffness KMS 9.43N/mm
• Compliance CMS 106µm/N
• Equivalent volume to the compliance VAS 49.5L
• Mechanical resistance RMS 22.4N·s/m

Dimensions

• Nominal diameter 12″
• 315mm
• Overall diameter 315mm
• Baffle cutout diameter 283mm
• Overall depth 232mm
• Flange thickness 29mm
• Mounting depth 203mm
• Volume occupied by the driver (estimated) 4.7L