Fi Car Audio TEAM 4 18 D2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 32.1Hz
• Mechanical quality factor QMS 9.79
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.45

Large signal parameters

• Maximum linear excursion xmax 33mm
• Air volume displaced at xmax VD 3993cm³
• Power handling P 4500W
• Program power Pmax 9000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.0Ω
• Inductance (1kHz, in series, estimated) LE 4.15mH

Magnet

• Force factor (in series) Bl 26.1N/A
• Motor constant Bl/√RE 15.1N/√W

Diaphragm

• Effective diameter 393mm
• Effective area SD 1210cm²
• Moving mass MMS 503g
• Moving mass (without air load) MMD 473g

Suspensions

• Stiffness KMS 14.7N/mm
• Compliance CMS 68µm/N
• Equivalent volume to the compliance VAS 95.4L
• Mechanical resistance RMS 10.4N·s/m

Dimensions

• Nominal diameter 18″
• 470mm
• Overall diameter 470mm
• Baffle cutout diameter 425mm
• Mounting depth 311mm
• Volume occupied by the driver 7.36L