Eminence ALPHA 4-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB
• Frequency response 105 - 12000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 123Hz
• Mechanical quality factor QMS 6.83
• Electrical quality factor QES 0.84
• Total quality factor QTS 0.75

Large signal parameters

• Maximum linear excursion xmax 2.6mm
• Maximum excursion before damage xlim 4.5mm
• Air volume displaced at xmax VD 15cm³
• Power handling P 55W
• Program power Pmax 110W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.7Ω
• Inductance (1kHz) LE 0.28mH
• VC Diameter 25.4mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 4.94N/A
• Motor constant Bl/√RE 1.9N/√W
• Air gap height HAG 3.7mm
• Weight 0.283kg
• Material Ferrite

Diaphragm

• Effective diameter 86mm
• Effective area SD 57.7cm²
• Moving mass MMS 4g
• Moving mass (without air load) MMD 3.7g
• Material Paper

Suspensions

• Stiffness KMS 2.38N/mm
• Compliance CMS 420µm/N
• Equivalent volume to the compliance VAS 1.94L
• Mechanical resistance RMS 0.45N·s/m
• Surround material Cloth

Dimensions

• Nominal diameter 4″
• 102mm
• Overall diameter 116mm
• Baffle cutout diameter 96mm
• Overall depth 59mm
• Volume occupied by the driver 0.34L
• Net weight 0.68kg
• Frame material Pressed Steel