ALPHA-8MRA 8" American Standard Series Speaker

Recommended for pro audio and bass guitar applications as a midrange. Sealed basket makes this woofer independent of enclosure design.

SPECIFICATION
Nominal Basket Diameter	8", 203 mm
Nominal Impedance*	8 Ω
Power Rating*
Program Power	250 W
Watts	125 W
Resonance	514 Hz
Usable Frequency Range	400 Hz - 4.8 kHz
Sensitivity*	100.9 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)	514 Hz
DC Resistance (Re)	7.32 Ω
Coil Inductance (Le)	0.34m H
Mechanical Q (Qms)	4.48
Electromagnetic Q (Qes)	2.08
Total Q (Qts)	1.42
Compliance Equivalent Volume (Vas)	0.8 liters / 0.03 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	0 cc
Mechanical Compliance of Suspension (Cms)	0.01 mm/N
BL Product (BL)	8.9 T-M
Diaphragm Mass Inc. Airload (MMs)	7 grams
Efficiency Bandwidth Product (EBP)	247
Maximum Linear Excursion (Xmax)	1.6 mm
Surface Area of Cone (Sd)	205.9 cm2
Maximum Mechanical Limit (Xlim)	3 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	N/a
Vented	- liters / - cu.ft.
Driver Volume Displaced	0.02 cu.ft. / 0.58 liters
Overall Diameter	8.22", 208.8 mm
Baffle Hole Diameter	7.19", 182.6 mm
Front Sealing Gasket	Yes
Rear Sealing Gasket	Yes
Mounting Holes Diameter	0.22", 5.6mm
Mounting Holes B.C.D.	7.78", 197.6mm
Depth	3.25", 82.6 mm
Net Weight	4.4 lbs, 2 kg
Shipping Weight	5.1 lbs, 2.31 kgs
MATERIALS OF CONSTRUCTION
Coil Construction	Copper voice coil
Coil Former	Polyimide former
Magnet Composition	Ferrite magnet
Core Details	Vented core

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