STX W.18.140.4.MCX

4Ω
8Ω

Low frequency

Nominal diameter8″ / 180 mm
Resonance40 Hz
Q factor0.36
Sensitivity88 dB
Linear excursion± 4 mm
Program power140 W
STX W.18.140.4.MCX Low frequencySTX W.18.140.4.MCX Low frequency
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 88dB
  • Frequency response 40 - 8000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 40Hz
  • Mechanical quality factor QMS 2.64
  • Electrical quality factor QES 0.42
  • Total quality factor QTS 0.36

Large signal parameters

  • Maximum linear excursion (one way) xmax 4mm
  • Maximum excursion before damage xlim 9mm
  • Air volume displaced at xmax VD 57cm³
  • Power handling P 70W
  • Program power Pmax 140W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.3Ω
  • Inductance (1kHz) LE 0.52mH
  • VC Diameter 25mm
  • Winding material Copper
  • Former material Aluminium

Magnet

  • Force factor Bl 5.5N/A
  • Motor constant Bl/√RE 3.03N/√W
  • Material Ferrite

Diaphragm

  • Effective diameter 135mm
  • Effective area SD 143cm²
  • Moving mass (including air load) MMS 15.5g
  • Moving mass MMD 14.2g
  • Material Modified cellulose

Suspensions

  • Stiffness KMS 0.99N/mm
  • Compliance CMS 1010µm/N
  • Equivalent volume to the compliance VAS 29L
  • Mechanical resistance RMS 1.48N·s/m

Dimensions

  • Nominal diameter 8″
  • 180mm
  • Overall diameter 180mm
  • Baffle cutout diameter 146mm
  • Overall depth 87mm
  • Volume occupied by the driver (estimated) 0.4L
  • Net weight 0.9kg
  • Frame material Plastic (ABS)
SPL
STX W.18.140.4.MCX SPL
STX W.18.140.4.MCX Dimensions

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