Fi Car Audio Alpha v2.1 12 S2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 37.5Hz
• Mechanical quality factor QMS 7.44
• Electrical quality factor QES 0.58
• Total quality factor QTS 0.54

Large signal parameters

• Maximum linear excursion xmax 17mm
• Air volume displaced at xmax VD 816cm³
• Power handling P 750W
• Program power Pmax 1500W

Voice Coil

• Nominal impedance Z 2Ω
• DC resistance RE 1.8Ω
• Inductance (1kHz, estimated) LE 1.35mH

Magnet

• Force factor Bl 12N/A
• Motor constant Bl/√RE 8.94N/√W

Diaphragm

• Effective diameter 247mm
• Effective area SD 480cm²
• Moving mass MMS 198g
• Moving mass (without air load) MMD 190g

Suspensions

• Stiffness KMS 11.1N/mm
• Compliance CMS 90µm/N
• Equivalent volume to the compliance VAS 29.4L
• Mechanical resistance RMS 6.27N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Mounting depth 165mm
• Volume occupied by the driver 4.81L