Fi Car Audio HT-1 18 S2

Subwoofer

Nominal diameter18″ / 470 mm
Resonance20.7 Hz
Q factor0.53
Sensitivity87.9 dB
Linear excursion± 27 mm
Program Power2000 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 87.9dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 20.7Hz
  • Mechanical quality factor QMS 6.89
  • Electrical quality factor QES 0.59
  • Total quality factor QTS 0.53

Large signal parameters

  • Maximum linear excursion xmax 27mm
  • Air volume displaced at xmax VD 3267cm³
  • Power handling P 1000W
  • Program power Pmax 2000W

Voice Coil

  • Nominal impedance Z 2Ω
  • DC resistance RE 1.4Ω
  • Inductance (1kHz, estimated) LE 1.94mH

Magnet

  • Force factor Bl 12.9N/A
  • Motor constant Bl/√RE 11.1N/√W

Diaphragm

  • Effective diameter 393mm
  • Effective area SD 1210cm²
  • Moving mass MMS 525g
  • Moving mass (without air load) MMD 495g

Suspensions

  • Stiffness KMS 9.23N/mm
  • Compliance CMS 108µm/N
  • Equivalent volume to the compliance VAS 222L
  • Mechanical resistance RMS 9.91N·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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