ALPHA-15A 15" American Standard Series Speaker

Recommended for professional audio and bass guitar applications as a woofer in a vented or sealed enclosure.

SPECIFICATION
Nominal Basket Diameter	15", 381 mm
Nominal Impedance*	8 Ω
Power Rating*
Program Power	400 W
Watts	200 W
Resonance	41 Hz
Usable Frequency Range	46 Hz - 3.5 kHz
Sensitivity*	97 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)	41 Hz
DC Resistance (Re)	5.88 Ω
Coil Inductance (Le)	0.84m H
Mechanical Q (Qms)	7.23
Electromagnetic Q (Qes)	1.53
Total Q (Qts)	1.26
Compliance Equivalent Volume (Vas)	260 liters / 9.18 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	325 cc
Mechanical Compliance of Suspension (Cms)	0.25 mm/N
BL Product (BL)	7.7 T-M
Diaphragm Mass Inc. Airload (MMs)	59 grams
Efficiency Bandwidth Product (EBP)	27
Maximum Linear Excursion (Xmax)	3.8 mm
Surface Area of Cone (Sd)	856.3 cm2
Maximum Mechanical Limit (Xlim)	8.4 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	71-85 liters / 2.5-3 cu.ft.
Vented	106-177 liters / 3.75-6.25 cu.ft.
Driver Volume Displaced	0.113 cu.ft. / 3.21 liters
Overall Diameter	15.15", 384.8 mm
Baffle Hole Diameter	13.87", 352.3 mm
Front Sealing Gasket	Yes
Rear Sealing Gasket	Yes
Mounting Holes Diameter	0.25", 6.4mm
Mounting Holes B.C.D.	14.56", 369.8mm
Depth	5.83", 148.1 mm
Net Weight	6.7 lbs, 3.04 kg
Shipping Weight	8.8 lbs, 3.99 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