Eminence ALPHA 3-8

8Ω
16Ω32Ω

Bass Guitar Speaker

Nominal diameter3″ / 76 mm
Resonance118 Hz
Q factor0.50
Sensitivity87.1 dB
Linear excursion± 2.4 mm
Program Power60 W
Eminence ALPHA 3-8 Bass Guitar Speaker
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 87.1dB
  • Frequency response 150 - 20000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 118Hz
  • Mechanical quality factor QMS 7.94
  • Electrical quality factor QES 0.53
  • Total quality factor QTS 0.50

Large signal parameters

  • Maximum linear excursion xmax 2.4mm
  • Maximum excursion before damage xlim 4mm
  • Air volume displaced at xmax VD 6.9cm³
  • Power handling P 30W
  • Program power Pmax 60W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.1Ω
  • Inductance (1kHz) LE 0.11mH
  • VC Diameter 20mm
  • Winding material Copper
  • Former material Polyimide

Magnet

  • Force factor Bl 3.93N/A
  • Motor constant Bl/√RE 1.74N/√W
  • Air gap height HAG 2.5mm
  • Weight 0.227kg
  • Material Ferrite

Diaphragm

  • Effective diameter 60mm
  • Effective area SD 28.6cm²
  • Moving mass MMS 2g
  • Moving mass (without air load) MMD 1.9g
  • Material Paper/Poly sandwich

Suspensions

  • Stiffness KMS 1.19N/mm
  • Compliance CMS 840µm/N
  • Equivalent volume to the compliance VAS 0.95L
  • Mechanical resistance RMS 0.19N·s/m
  • Surround material Poly

Dimensions

  • Nominal diameter 3″
  • 76mm
  • Overall diameter 101mm
  • Baffle cutout diameter 77mm
  • Overall depth 45mm
  • Volume occupied by the driver 0.14L
  • Net weight 0.408kg
  • Frame material Pressed Steel
SPL & Impedance
Eminence ALPHA 3-8 SPL & Impedance
PDF fileDatasheet

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