Fi Car Audio IB315 v2 S4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 26.1Hz
• Mechanical quality factor QMS 8.73
• Electrical quality factor QES 0.83
• Total quality factor QTS 0.76

Large signal parameters

• Maximum linear excursion xmax 34mm
• Air volume displaced at xmax VD 2754cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz, estimated) LE 3.54mH

Magnet

• Force factor Bl 15N/A
• Motor constant Bl/√RE 7.91N/√W

Diaphragm

• Effective diameter 321mm
• Effective area SD 810cm²
• Moving mass MMS 298g
• Moving mass (without air load) MMD 281g

Suspensions

• Stiffness KMS 7.87N/mm
• Compliance CMS 127µm/N
• Equivalent volume to the compliance VAS 115L
• Mechanical resistance RMS 5.6N·s/m

Dimensions

• Nominal diameter 15″
• 397mm
• Overall diameter 397mm
• Baffle cutout diameter 359mm
• Mounting depth 203mm
• Volume occupied by the driver 4.81L