D.A.S. Audio 18S

Low frequency

Nominal diameter18″ / 457 mm
Resonance33 Hz
Q factor0.33
Sensitivity95.9 dB
Linear excursion± 8 mm
Program Power1600 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 95.9dB
  • Frequency response 25 - 2000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 33Hz
  • Mechanical quality factor QMS 6.92
  • Electrical quality factor QES 0.35
  • Total quality factor QTS 0.33

Large signal parameters

  • Maximum linear excursion xmax 8mm
  • Maximum excursion before damage xlim 15.5mm
  • Air volume displaced at xmax VD 931cm³
  • Power handling P 800W
  • Program power Pmax 1600W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 6.3Ω
  • Inductance (1kHz, estimated) LE 3.92mH
  • VC Diameter 102mm
  • Winding height HVC 21mm
  • Winding material Copper EFW
  • Former material Glass Fibre Reinforced Polymer

Magnet

  • Flux density B 1.02T
  • Force factor Bl 23.7N/A
  • Motor constant Bl/√RE 9.44N/√W
  • Air gap height HAG 10mm
  • Material Ferrite

Diaphragm

  • Effective diameter 385mm
  • Effective area SD 1164cm²
  • Moving mass MMS 150g
  • Moving mass (without air load) MMD 122g

Suspensions

  • Stiffness KMS 6.37N/mm
  • Compliance CMS 157µm/N
  • Equivalent volume to the compliance VAS 302L
  • Mechanical resistance RMS 4.49N·s/m
  • Surround material Polycotton
  • Spider material Polycotton

Dimensions

  • Nominal diameter 18
  • 457mm
  • Baffle cutout diameter 415mm
  • Volume occupied by the driver (estimated) 5.6L
  • Net weight 12.2kg
  • Frame material Injected Aluminum
D.A.S. Audio 18S Impedance
D.A.S. Audio 18S SPL
D.A.S. Audio 18S Distortion


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