Fi Car Audio SSD NEO 18 D1

2x1Ω
2x2Ω

Subwoofer

Nominal diameter18″ / 470 mm
Resonance35.7 Hz
Q factor0.53
Sensitivity92.6 dB
Linear excursion± 28 mm
Program Power3500 W
mm05101520101001 00010 000Diaphragm Excursion
m/s0246810101001 00010 000Diaphragm Velocity
dB60708090100110120101001 00010 000SPL (1W, 1m, on axis)
°-180-120-60060120180101001 00010 000Acoustical phase (1m, on axis)
ms051015202530101001 00010 000Group Delay (1m, on axis)
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 92.6dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 35.7Hz
  • Mechanical quality factor QMS 7.73
  • Electrical quality factor QES 0.57
  • Total quality factor QTS 0.53

Large signal parameters

  • Maximum linear excursion xmax 28mm
  • Air volume displaced at xmax VD 3388cm³
  • Power handling P 1750W
  • Program power Pmax 3500W

Voice Coil

  • Nominal impedance Z 2 x 1Ω
  • DC resistance (in series) RE 1.4Ω
  • Inductance (1kHz, in series, estimated) LE 1.39mH

Magnet

  • Force factor (in series) Bl 13N/A
  • Motor constant Bl/√RE 11N/√W

Diaphragm

  • Effective diameter 393mm
  • Effective area SD 1210cm²
  • Moving mass MMS 302g
  • Moving mass (without air load) MMD 272g

Suspensions

  • Stiffness KMS 15.9N/mm
  • Compliance CMS 63µm/N
  • Equivalent volume to the compliance VAS 131L
  • Mechanical resistance RMS 8.76N·s/m

Dimensions

  • Nominal diameter 18
  • 470mm
  • Overall diameter 470mm
  • Baffle cutout diameter 425mm
  • Mounting depth 241mm
  • Volume occupied by the driver 6.23L
Ω°0102030405060101001 00010 000-180-120-60060120180Electrical ImpedanceElectrical Phase
Step response
Response to a tone burst of Hz with cycles


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