MD Lab SW-S12

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 39.4Hz
• Mechanical quality factor QMS 2.47
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.43

Large signal parameters

• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.8Ω
• Inductance (1kHz, estimated) LE 2.15mH

Magnet

• Force factor Bl 15.3N/A
• Motor constant Bl/√RE 7.86N/√W

Diaphragm

• Effective diameter 270mm
• Effective area SD 574cm²
• Moving mass MMS 130g
• Moving mass (without air load) MMD 121g

Suspensions

• Stiffness KMS 8N/mm
• Compliance CMS 125µm/N
• Equivalent volume to the compliance VAS 58.3L
• Mechanical resistance RMS 13.1N·s/m

Dimensions

• Nominal diameter 12″
• 322mm
• Overall diameter 322mm
• Baffle cutout diameter 288mm
• Overall depth 98mm
• Flange thickness 16mm
• Mounting depth 82mm
• Volume occupied by the driver (estimated) 1.5L