Fi Car Audio HT-3 18 S2

Subwoofer

Nominal diameter18″ / 470 mm
Resonance21.2 Hz
Q factor0.42
Sensitivity89 dB
Linear excursion± 34 mm
Program Power4000 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 89dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 21.2Hz
  • Mechanical quality factor QMS 6.75
  • Electrical quality factor QES 0.45
  • Total quality factor QTS 0.42

Large signal parameters

  • Maximum linear excursion xmax 34mm
  • Air volume displaced at xmax VD 4114cm³
  • Power handling P 2000W
  • Program power Pmax 4000W

Voice Coil

  • Nominal impedance Z 2Ω
  • DC resistance RE 1.7Ω
  • Inductance (1kHz, estimated) LE 2.32mH

Magnet

  • Force factor Bl 15.7N/A
  • Motor constant Bl/√RE 12N/√W

Diaphragm

  • Effective diameter 393mm
  • Effective area SD 1210cm²
  • Moving mass MMS 487g
  • Moving mass (without air load) MMD 457g

Suspensions

  • Stiffness KMS 8.69N/mm
  • Compliance CMS 115µm/N
  • Equivalent volume to the compliance VAS 236L
  • Mechanical resistance RMS 9.61N·s/m

Dimensions

  • Nominal diameter 18
  • 470mm
  • Overall diameter 470mm
  • Baffle cutout diameter 425mm
  • Mounting depth 165mm
  • Volume occupied by the driver 5.1L


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