Fi Car Audio X12 D4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 31.6Hz
• Mechanical quality factor QMS 6.51
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 20mm
• Air volume displaced at xmax VD 960cm³
• Power handling P 750W
• Program power Pmax 1500W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 5.6Ω
• Inductance (1kHz, in series, estimated) LE 3.96mH

Magnet

• Force factor (in series) Bl 19.8N/A
• Motor constant Bl/√RE 8.37N/√W

Diaphragm

• Effective diameter 247mm
• Effective area SD 480cm²
• Moving mass MMS 181g
• Moving mass (without air load) MMD 173g

Suspensions

• Stiffness KMS 7.09N/mm
• Compliance CMS 141µm/N
• Equivalent volume to the compliance VAS 46.1L
• Mechanical resistance RMS 5.53N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Mounting depth 165mm
• Volume occupied by the driver 2.27L