Fi Car Audio SP3 12 D2

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

Thiele & Small parameters

• Resonance frequency (free air) fS 33.7Hz
• Mechanical quality factor QMS 5.97
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 34mm
• Air volume displaced at xmax VD 1632cm³
• Power handling P 2500W
• Program power Pmax 5000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.6Ω
• Inductance (1kHz, in series, estimated) LE 3.45mH

Magnet

• Force factor (in series) Bl 25.7N/A
• Motor constant Bl/√RE 13.5N/√W

Diaphragm

• Effective diameter 247mm
• Effective area SD 480cm²
• Moving mass MMS 287g
• Moving mass (without air load) MMD 279g

Suspensions

• Stiffness KMS 12.8N/mm
• Compliance CMS 77.9µm/N
• Equivalent volume to the compliance VAS 25.1L
• Mechanical resistance RMS 10.2N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Mounting depth 254mm
• Volume occupied by the driver 5.38L