Fi Car Audio BTL3 18 D2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 32.3Hz
• Mechanical quality factor QMS 7.52
• Electrical quality factor QES 0.38
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 34mm
• Air volume displaced at xmax VD 4114cm³
• 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 4.3mH

Magnet

• Force factor (in series) Bl 28.2N/A
• Motor constant Bl/√RE 14.9N/√W

Diaphragm

• Effective diameter 393mm
• Effective area SD 1210cm²
• Moving mass MMS 399g
• Moving mass (without air load) MMD 369g

Suspensions

• Stiffness KMS 16.6N/mm
• Compliance CMS 60.4µm/N
• Equivalent volume to the compliance VAS 125L
• Mechanical resistance RMS 10.8N·s/m

Dimensions

• Nominal diameter 18″
• 470mm
• Overall diameter 470mm
• Baffle cutout diameter 425mm
• Mounting depth 241mm
• Volume occupied by the driver 2.83L