Eighteen Sound 8NCX900

8Ω

Coaxial

Nominal diameter8″ / 210 mm
Resonance130 Hz
Q factor0.26
Sensitivity97.1 dB
Linear excursion± 3.2 mm
Program Power600 W
Eighteen Sound 8NCX900 CoaxialEighteen Sound 8NCX900 Coaxial
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
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

Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 97.1dB
  • Frequency response 100 - 23000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 130Hz
  • Mechanical quality factor QMS 8.00
  • Electrical quality factor QES 0.27
  • Total quality factor QTS 0.26

Large signal parameters

  • Maximum linear excursion (one way) xmax 3.2mm
  • Maximum excursion before damage xlim 7.5mm
  • Air volume displaced at xmax VD 74cm³
  • Power handling P 300W
  • Program power Pmax 600W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 4.9Ω
  • Inductance (1kHz) LE 0.6mH
  • VC Diameter 75mm
  • Winding material Copper Clad Aluminum

Magnet

  • Force factor Bl 19N/A
  • Motor constant Bl/√RE 8.58N/√W
  • Material Neodymium

Diaphragm

  • Effective diameter 171mm
  • Effective area SD 230cm²
  • Moving mass MMS 25g
  • Moving mass (without air load) MMD 22.3g
  • Material Straight

Suspensions

  • Stiffness KMS 18.9N/mm
  • Compliance CMS 53µm/N
  • Equivalent volume to the compliance VAS 4L
  • Mechanical resistance RMS 2.55N·s/m
  • Surround material Triple roll, Polycotton

Dimensions

  • Nominal diameter 8″
  • 210mm
  • Overall diameter 225mm
  • Baffle cutout diameter 184mm
  • Overall depth 127mm
  • Flange thickness 11mm
  • Mounting depth 116mm
  • Volume occupied by the driver (estimated) 1.7L
  • Net weight 4.5kg
Impedance
SPL
Eighteen Sound 8NCX900 Impedance
Eighteen Sound 8NCX900 SPL
Eighteen Sound 8NCX900 Dimensions

Export this driver to a simulation software:

Closed Box Simulator·Speakerbench logoSpeakerbenchWinISD logoWinISDBasta! logoBasta!Hornresp logoHornrespQSpeakers logoQSpeakersSpeakerSim logoSpeakerSimMfbLabs logoMfbLabsAmplion logoAmplion

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