Click Here to Download 8 ohm PDF Spec Sheet
Click Here to Download 8 ohm PDF Cabinet Design
ALPHA-12A
SPECIFICATION
Nominal Basket Diameter 12", 304.8mm
Nominal Impedance* 8 ohms
Power Rating
Watts 150W
Music Program 300W
Resonance 49Hz
Usable Frequency Range 51Hz-4.3kHz
Sensitivity*** 95.6
Magnet Weight 20 oz.
Gap Height 0.25", 6.35mm
Voice Coil Diameter 1.5", 38.1mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 49Hz
DC Resistance (Re) 6.3
Coil Inductance (Le) 0.79mH
Mechanical Q (Qms) 6.53
Electromagnetic Q (Qes) 0.88
Total Q (Qts) 0.77
Compliance Equivalent Volume (Vas) 121.5 liters / 4.3 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 125cc
Mechanical Compliance of Suspension (Cms) 0.32mm/N
BL Product (BL) 8.5 T-M
Diaphram Mass inc. Airload (Mms) 33 grams
Efficiency Bandwidth Product (EBP) 56
Maximum Linear Excursion (Xmax) 2.4mm
Surface Area of Cone (Sd) 519.5 cm2
Maximum Mechanical Limit (Xlim) 6.6mm

MOUNTING INFORMATION
Recommended Enclosure
Sealed 17-22.7 liters/0.6-0.8 cu.ft.
Vented 56.6-113.3 liters/2-4 cu.ft.
Overall Diameter 12.26", 311.4mm
Baffle Hole Diameter 11", 279.5mm
Front Sealing Gasket Fitted as standard
Rear Sealing Gasket Fitted as standard
Mounting Holes Diameter 0.25", 6.4mm
Mounting Holes B.C. D. 11.71", 297.5mm
Depth 4.73", 120mm
Net Weight 5.3 lbs., 2.4 kg
Shipping Weight 7.4 lbs., 3.4 kg

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
Dustcap Composition Solid composition felt dust cap