Fi Car Audio X15 D4

2x2Ω
2x4Ω

Subwoofer

Nominal diameter15″ / 397 mm
Resonance30 Hz
Q factor0.53
Sensitivity89.4 dB
Linear excursion± 20 mm
Program Power1500 W
Discontinued
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 89.4dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 30Hz
  • Mechanical quality factor QMS 7.48
  • Electrical quality factor QES 0.57
  • Total quality factor QTS 0.53

Large signal parameters

  • Maximum linear excursion xmax 20mm
  • Air volume displaced at xmax VD 1620cm³
  • Power handling P 750W
  • Program power Pmax 1500W

Voice Coil

  • Nominal impedance Z 2 x 4Ω
  • DC resistance (in series) RE 5.6Ω
  • Inductance (1kHz, in series, estimated) LE 4.39mH

Magnet

  • Force factor (in series) Bl 19.8N/A
  • Motor constant Bl/√RE 8.37N/√W

Diaphragm

  • Effective diameter 321mm
  • Effective area SD 810cm²
  • Moving mass MMS 212g
  • Moving mass (without air load) MMD 195g

Suspensions

  • Stiffness KMS 7.69N/mm
  • Compliance CMS 130µm/N
  • Equivalent volume to the compliance VAS 121L
  • Mechanical resistance RMS 5.34N·s/m

Dimensions

  • Nominal diameter 15
  • 397mm
  • Overall diameter 397mm
  • Baffle cutout diameter 359mm
  • Mounting depth 191mm
  • Volume occupied by the driver 2.55L


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