Fi Car Audio SSD18 D2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27.6Hz
• Mechanical quality factor QMS 7.14
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.45

Large signal parameters

• Maximum linear excursion xmax 22mm
• Air volume displaced at xmax VD 2662cm³
• Power handling P 1250W
• Program power Pmax 2500W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.0Ω
• Inductance (1kHz, in series, estimated) LE 3.58mH

Magnet

• Force factor (in series) Bl 24.3N/A
• Motor constant Bl/√RE 14N/√W

Diaphragm

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

Suspensions

• Stiffness KMS 22.7N/mm
• Compliance CMS 44µm/N
• Equivalent volume to the compliance VAS 91.4L
• Mechanical resistance RMS 9.69N·s/m

Dimensions

• Nominal diameter 18″
• 470mm
• Overall diameter 470mm
• Baffle cutout diameter 425mm
• Mounting depth 241mm
• Volume occupied by the driver 6.23L