Fi Car Audio SP4 12 D1

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27.9Hz
• Mechanical quality factor QMS 6.08
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 33mm
• Air volume displaced at xmax VD 1584cm³
• Power handling P 3000W
• Program power Pmax 6000W

Voice Coil

• Nominal impedance Z 2 x 1Ω
• DC resistance (in series) RE 1.3Ω
• Inductance (1kHz, in series, estimated) LE 1.52mH

Magnet

• Force factor (in series) Bl 13.7N/A
• Motor constant Bl/√RE 12N/√W

Diaphragm

• Effective diameter 247mm
• Effective area SD 480cm²
• Moving mass MMS 386g
• Moving mass (without air load) MMD 378g

Suspensions

• Stiffness KMS 11.8N/mm
• Compliance CMS 84.5µm/N
• Equivalent volume to the compliance VAS 27.4L
• Mechanical resistance RMS 11.1N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Mounting depth 286mm
• Volume occupied by the driver 5.38L