Dayton Audio Ultimax II UMII8-22

2x2Ω

Subwoofer

Nominal diameter8″ / 185 mm
Resonance46 Hz
Q factor0.75
Sensitivity81.3 dB
Linear excursion± 18 mm
Program Power800 W
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 81.3dB
  • Frequency response 30 - 600Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 46Hz
  • Mechanical quality factor QMS 3.10
  • Electrical quality factor QES 0.99
  • Total quality factor QTS 0.75

Large signal parameters

  • Maximum linear excursion xmax 18mm
  • Air volume displaced at xmax VD 360cm³
  • Power handling P 400W
  • Program power Pmax 800W

Voice Coil

  • Nominal impedance Z 2 x 2Ω
  • DC resistance (in series) RE 3.9Ω
  • Inductance (1kHz, in series) LE 0.75mH
  • VC Diameter 63.5mm

Magnet

  • Force factor (in series) Bl 9.7N/A
  • Motor constant Bl/√RE 4.91N/√W
  • Material Ferrite

Diaphragm

  • Effective diameter 160mm
  • Effective area SD 200cm²
  • Moving mass MMS 82g
  • Moving mass (without air load) MMD 80.1g
  • Material Carbon Fiber

Suspensions

  • Stiffness KMS 6.76N/mm
  • Compliance CMS 148µm/N
  • Equivalent volume to the compliance VAS 8.4L
  • Mechanical resistance RMS 7.65N·s/m
  • Surround material Rubber

Dimensions

  • Nominal diameter 8
  • 185mm
  • Overall diameter 185mm
  • Baffle cutout diameter 145mm
  • Overall depth 144mm
  • Volume occupied by the driver (estimated) 1.2L
  • Frame material Cast Aluminium
Dayton Audio UMII8-22 Impedance
Dayton Audio UMII8-22 SPL


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