Recommended for professional
audio and bass guitar applications
as a woofer in a vented enclosure.
Also works well for PA in a sealed or
bandpass enclosure.
SPECIFICATION :
Nominal Basket Diameter 12" , 305 mm
Nominal Impedance* 8 ©
Power Rating* *
Watts 250 W
Music Program 500 W
Resonance 47 Hz
Usable Frequency Range 43 Hz - 3.8 kHz
Sensitivity* * * 98 dB
Magnet Weight 38 oz.
Gap Height 0.312" , 7.9 mm
Voice Coil Diameter 2" , 51 mm
EMINENCE BETA 12A
THIELE & SMALL PARAMETERS :
Resonant Frequency ( fs) 47 Hz
DC Resistance ( Re) 5 ©
Coil Inductance ( Le) 0.64m H
Mechanical Q ( Qms) 6
Electromagnetic Q ( Qes) 0.5
Total Q ( Qts) 0.46
Compliance Equivalent Volume ( Vas) 120.1 liters / 4.24 cu.ft.
Peak Diaphragm Displacement Volume ( Vd) 237 cc
Mechanical Compliance of Suspension ( Cms) 0.29 mm/ N
BL Product ( BL) 10.8 T-M
Diaphragm Mass Inc. Airload ( MMs) 40 grams
Efficiency Bandwidth Product ( EBP) 94
Maximum Linear Excursion ( Xmax) 4.4 mm
Surface Area of Cone ( Sd) 538.9 cm2
Maximum Mechanical Limit ( Xlim) 11. mm
MOUNTING INFORMATION :
Recommended Enclosure Volume
Sealed 25.5-35.4 liters / 0.9-1.25 cu.ft.
Vented 36.8-139 liters / 1.3-4.9 cu.ft.
Driver Volume Displaced 0.071 cu.ft. / 2 liters
Overall Diameter 12.03" , 305.6 mm
Baffle Hole Diameter 11.07" , 281.2 mm
Front Sealing Gasket Yes
Rear Sealing Gasket Yes
Mounting Holes Diameter 0.25" , 6.4mm
Mounting Holes B.C.D. 11.59" , 294.4mm
Depth 4.57" , 116.1 mm
Net Weight 7.5 lbs, 3.4 kg
Shipping Weight 9.7 lbs, 4.4 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 paper dust cap