Fi Car Audio SP3 15+ D2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 91dB

Thiele & Small parameters

• Resonance frequency (free air) fS 32.4Hz
• Mechanical quality factor QMS 6.65
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 34mm
• Air volume displaced at xmax VD 2754cm³
• 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 3.88mH

Magnet

• Force factor (in series) Bl 31.1N/A
• Motor constant Bl/√RE 16.4N/√W

Diaphragm

• Effective diameter 321mm
• Effective area SD 810cm²
• Moving mass MMS 342g
• Moving mass (without air load) MMD 325g

Suspensions

• Stiffness KMS 14.1N/mm
• Compliance CMS 70.7µm/N
• Equivalent volume to the compliance VAS 64.9L
• Mechanical resistance RMS 10.5N·s/m

Dimensions

• Nominal diameter 15″
• 397mm
• Overall diameter 397mm
• Baffle cutout diameter 359mm
• Mounting depth 279mm
• Volume occupied by the driver 5.95L