Eminence ALPHA-12A

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.4dB
• Frequency response 51 - 4300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 49Hz
• Mechanical quality factor QMS 6.53
• Electrical quality factor QES 0.88
• Total quality factor QTS 0.77

Large signal parameters

• Maximum linear excursion xmax 2.4mm
• Maximum excursion before damage xlim 6.6mm
• Air volume displaced at xmax VD 125cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.3Ω
• Inductance (1kHz) LE 0.79mH
• VC Diameter 38.1mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 8.5N/A
• Motor constant Bl/√RE 3.39N/√W
• Air gap height HAG 6.4mm
• Weight 0.567kg
• Material Ferrite

Diaphragm

• Effective diameter 257mm
• Effective area SD 520cm²
• Moving mass MMS 33g
• Moving mass (without air load) MMD 24.5g
• Material Paper

Suspensions

• Stiffness KMS 3.13N/mm
• Compliance CMS 320µm/N
• Equivalent volume to the compliance VAS 122L
• Mechanical resistance RMS 1.56N·s/m
• Surround material Cloth

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 311mm
• Baffle cutout diameter 281mm
• Overall depth 120mm
• Volume occupied by the driver 1.78L
• Net weight 2.404kg
• Frame material Pressed Steel