Fi Car Audio Alpha v2.1 12 S4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 7.40
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.53

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 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 2.37mH

Magnet

• Force factor Bl 15.9N/A
• Motor constant Bl/√RE 8.89N/√W

Diaphragm

• Effective diameter 247mm
• Effective area SD 480cm²
• Moving mass MMS 194g
• Moving mass (without air load) MMD 186g

Suspensions

• Stiffness KMS 11.1N/mm
• Compliance CMS 90µm/N
• Equivalent volume to the compliance VAS 29.2L
• Mechanical resistance RMS 6.26N·s/m

Dimensions

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