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Eminence - ALPHA-12A
Eminence - ALPHA-12A_2
Eminence - ALPHA-12A_3
Eminence - ALPHA-12A_4

Eminence - ALPHA-12A

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Recommended for professional audio mid-bass applications in a small sealed or medium vented enclosure.


SPECIFICATION
Nominal Basket Diameter 12", 305 mm
Nominal Impedance* 8 Ω
Power Rating*
Program Power 300 W
Watts 150 W
Resonance 49 Hz
Usable Frequency Range 51 Hz - 4.3 kHz
Sensitivity* 95.6 dB
Magnet Weight 20 oz.
Gap Height 0.25", 6.4 mm
Voice Coil Diameter 1.5", 38 mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 49 Hz
DC Resistance (Re) 6.3 Ω
Coil Inductance (Le) 0.79m H
Mechanical Q (Qms) 6.53
Electromagnetic Q (Qes) 0.88
Total Q (Qts) 0.77
Compliance Equivalent Volume (Vas) 121.5 liters / 4.29 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 125 cc
Mechanical Compliance of Suspension (Cms) 0.32 mm/N
BL Product (BL) 8.5 T-M
Diaphragm Mass Inc. Airload (MMs) 33 grams
Efficiency Bandwidth Product (EBP) 56
Maximum Linear Excursion (Xmax) 2.4 mm
Surface Area of Cone (Sd) 519.5 cm2
Maximum Mechanical Limit (Xlim) 6.6 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed 17-22.7 liters / 0.6-0.8 cu.ft.
Vented 56.6-113.3 liters / 2-4 cu.ft.
Driver Volume Displaced 0.063 cu.ft. / 1.78 liters
Overall Diameter 12.26", 311.4 mm
Baffle Hole Diameter 11.06", 280.9 mm
Front Sealing Gasket Yes
Rear Sealing Gasket Yes
Mounting Holes Diameter 0.25", 6.4mm
Mounting Holes B.C.D. 11.71", 297.4mm
Depth 4.73", 120.1 mm
Net Weight 5.3 lbs, 2.4 kg
Shipping Weight 7.4 lbs, 3.36 kgs
MATERIALS OF CONSTRUCTION
Coil Construction Copper voice coil
Coil Former Polyimide former
Magnet Composition Ferrite magnet
Core Details Vented and extended core


Basket Materials Pressed steel basket
Cone Composition Paper cone
Cone Edge Composition Cloth cone edge
Dust Cap Composition Solid composition felt dust cap