Fi Car Audio X15 D4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 7.48
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 20mm
• Air volume displaced at xmax VD 1620cm³
• 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 4.39mH

Magnet

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

Diaphragm

• Effective diameter 321mm
• Effective area SD 810cm²
• Moving mass MMS 212g
• Moving mass (without air load) MMD 195g

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 121L
• Mechanical resistance RMS 5.34N·s/m

Dimensions

• Nominal diameter 15″
• 397mm
• Overall diameter 397mm
• Baffle cutout diameter 359mm
• Mounting depth 191mm
• Volume occupied by the driver 2.55L