Eminence ALPHA 2-8

Full-range

Nominal diameter2″ / 51 mm
Resonance186 Hz
Q factor0.72
Sensitivity81.5 dB
Linear excursion± 1.7 mm
Program Power30 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 81.5dB
  • Frequency response 200 - 20000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 186Hz
  • Mechanical quality factor QMS 3.06
  • Electrical quality factor QES 0.94
  • Total quality factor QTS 0.72

Large signal parameters

  • Maximum linear excursion xmax 1.7mm
  • Maximum excursion before damage xlim 2.2mm
  • Air volume displaced at xmax VD 2.1cm³
  • Power handling P 20W
  • Program power Pmax 30W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 6.4Ω
  • Inductance (1kHz) LE 0.13mH
  • VC Diameter 16mm
  • Winding material Copper
  • Former material Polyimide

Magnet

  • Force factor Bl 2.64N/A
  • Motor constant Bl/√RE 1.04N/√W
  • Air gap height HAG 3mm
  • Weight 0.085kg

Diaphragm

  • Effective diameter 40mm
  • Effective area SD 12.4cm²
  • Moving mass MMS 1g
  • Moving mass (without air load) MMD 1g

Suspensions

  • Stiffness KMS 1.19N/mm
  • Compliance CMS 840µm/N
  • Equivalent volume to the compliance VAS 0.18L
  • Mechanical resistance RMS 0.38N·s/m
  • Surround material Paper/Poly Sandwich

Dimensions

  • Nominal diameter 2
  • 51mm
  • Overall diameter 54mm
  • Baffle cutout diameter 51mm
  • Volume occupied by the driver 0.03L
  • Net weight 0.18kg
  • Frame material Pressed steel
Eminence ALPHA 2-8 SPL & Impedance


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