Fi Car Audio SP3 12+ D2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 35.2Hz
• Mechanical quality factor QMS 6.41
• Electrical quality factor QES 0.24
• Total quality factor QTS 0.23

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 31.1N/A
• Motor constant Bl/√RE 16.4N/√W

Diaphragm

• Effective diameter 247mm
• Effective area SD 480cm²
• Moving mass MMS 286g
• Moving mass (without air load) MMD 278g

Suspensions

• Stiffness KMS 14N/mm
• Compliance CMS 71.6µm/N
• Equivalent volume to the compliance VAS 23.1L
• Mechanical resistance RMS 9.87N·s/m

Dimensions

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