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ALPHA-15A
SPECIFICATION
Nominal Basket Diameter 15", 381mm
Nominal Impedance* 8 ohms
Power Rating
Watts 200W
Music Program 400W
Resonance 41Hz
Usable Frequency Range 46Hz-3.5kHz
Sensitivity*** 97
Magnet Weight 25 oz.
Gap Height 0.25", 6.35mm
Voice Coil Diameter 1.5", 38.1mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 41Hz
DC Resistance (Re) 5.88
Coil Inductance (Le) 0.84mH
Mechanical Q (Qms) 7.23
Electromagnetic Q (Qes) 1.53
Total Q (Qts) 1.26
Compliance Equivalent Volume (Vas) 260.0 liters / 9.2 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 325cc
Mechanical Compliance of Suspension (Cms) 0.25mm/N
BL Product (BL) 7.7 T-M
Diaphram Mass inc. Airload (Mms) 59 grams
Efficiency Bandwidth Product (EBP) 27
Maximum Linear Excursion (Xmax) 3.8mm
Surface Area of Cone (Sd) 856.3 cm2
Maximum Mechanical Limit (Xlim) 8.4mm

MOUNTING INFORMATION
Recommended Enclosure
Sealed 71-85 liters/2.5-3 cu.ft.
Vented 106-177 liters/3.75-6.25 cu.ft.
Overall Diameter 15.15", 384.8mm
Baffle Hole Diameter 13.77", 349.6mm
Front Sealing Gasket Fitted as standard
Rear Sealing Gasket Fitted as standard
Mounting Holes Diameter 0.25", 6.4mm
Mounting Holes B.C. D. 14.56", 369.9mm
Depth 5.83", 148mm
Net Weight 6.7 lbs., 3 kg
Shipping Weight 8.8 lbs., 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 paper dust cap