ALPHA 4-8 4" ( 2 Each ) American Standard Series Speaker

Ideally suited for line arrays, car doors, side panels, and other tight-fitting applications, the Alpha 4 is a versatile 110-watt driver that can be used full range, midbass, or as a midrange. They can be stacked in a column for vocal applications or with a tweeter and a sub for compact, high-performance PA or MI applications.

SPECIFICATION
Nominal Basket Diameter	4", 102 mm
Nominal Impedance*	8 Ω
Power Rating*
Program Power	110 W
Watts	55 W
Resonance	123 Hz
Usable Frequency Range	105 Hz - 12 kHz
Sensitivity*	88 dB
Magnet Weight	10 oz.
Gap Height	0.144", 3.7 mm
Voice Coil Diameter	1", 25 mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)	123 Hz
DC Resistance (Re)	6.73 Ω
Coil Inductance (Le)	0.28m H
Mechanical Q (Qms)	6.83
Electromagnetic Q (Qes)	0.84
Total Q (Qts)	0.75
Compliance Equivalent Volume (Vas)	1.94 liters / 0.07 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	15 cc
Mechanical Compliance of Suspension (Cms)	0.42 mm/N
BL Product (BL)	4.94 T-M
Diaphragm Mass Inc. Airload (MMs)	4 grams
Efficiency Bandwidth Product (EBP)	146
Maximum Linear Excursion (Xmax)	2.6 mm
Surface Area of Cone (Sd)	57.7 cm2
Maximum Mechanical Limit (Xlim)	4.5 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	1.87-8.5 liters / 0.07-0.3 cu.ft.
Vented	2.27-4.25 liters / 0.08-0.15 cu.ft.
Driver Volume Displaced	0.012 cu.ft. / 0.33 liters
Overall Diameter	4.57", 116.1 mm
Baffle Hole Diameter	3.77", 95.8 mm
Front Sealing Gasket	Yes
Rear Sealing Gasket	Yes
Mounting Holes Diameter	0.15", 3.8mm
Mounting Holes B.C.D.	4.25", 108mm
Depth	2.31", 58.7 mm
Net Weight	1.5 lbs, 0.68 kg
Shipping Weight	3.3 lbs, 1.5 kgs
MATERIALS OF CONSTRUCTION
Coil Construction	Copper voice coil
Coil Former	Polyimide former
Magnet Composition	Ferrite magnet
Core Details	Non-Vented core

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