Click Here to Download 8 ohm PDF Spec Sheet

***This speaker incorporates the use of a closed back chassis and does not require a tuned enclosure to enhance performance.

ALPHA-8MRA
SPECIFICATION
Nominal Basket Diameter 8", 203.2mm
Nominal Impedance* 8 ohms
Power Rating
Watts 125W
Music Program 250W
Resonance 514Hz
Usable Frequency Range 400Hz-4.8kHz
Sensitivity*** 100.9
Magnet Weight 20 oz.
Gap Height 0.25", 6.35mm
Voice Coil Diameter 1.5", 38.1mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 514Hz
DC Resistance (Re) 7.32
Coil Inductance (Le) 0.34mH
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) 0cc
Mechanical Compliance of Suspension (Cms) 0.01mm/N
BL Product (BL) 8.9 T-M
Diaphram Mass inc. Airload (Mms) 6.9 grams
Efficiency Bandwidth Product (EBP) 247
Maximum Linear Excursion (Xmax) 1.6mm
Surface Area of Cone (Sd) 205.9 cm2
Maximum Mechanical Limit (Xlim) 3.0mm

MOUNTING INFORMATION
Recommended Enclosure
Sealed N/A
Vented N/A
Overall Diameter 8.22", 208.8mm
Baffle Hole Diameter 7.19", 182.5mm
Front Sealing Gasket Fitted as standard
Rear Sealing Gasket Fitted as standard
Mounting Holes Diameter 0.22", 5.5mm
Mounting Holes B.C. D. 7.75", 196.9mm
Depth 3.25", 83mm
Net Weight 4.4 lbs., 2 kg
Shipping Weight 5.1 lbs., 2.3 kg

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
Dustcap Composition Solid composition paper dust cap