Fi Car Audio Q18 NEO D1

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.2dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27.9Hz
• Mechanical quality factor QMS 9.01
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.50

Large signal parameters

• Maximum linear excursion xmax 34mm
• Air volume displaced at xmax VD 4114cm³
• Power handling P 1750W
• Program power Pmax 3500W

Voice Coil

• Nominal impedance Z 2 x 1Ω
• DC resistance (in series) RE 1.8Ω
• Inductance (1kHz, in series, estimated) LE 2.19mH

Magnet

• Force factor (in series) Bl 15.3N/A
• Motor constant Bl/√RE 11.4N/√W

Diaphragm

• Effective diameter 393mm
• Effective area SD 1210cm²
• Moving mass MMS 409g
• Moving mass (without air load) MMD 379g

Suspensions

• Stiffness KMS 12.5N/mm
• Compliance CMS 80.3µm/N
• Equivalent volume to the compliance VAS 165L
• Mechanical resistance RMS 7.96N·s/m

Dimensions

• Nominal diameter 18″
• 470mm
• Overall diameter 470mm
• Baffle cutout diameter 425mm
• Mounting depth 286mm
• Volume occupied by the driver 6.8L