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Eminence ALPHA8MRA

Price: $49.99
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Recommended for professional audio and bass guitar applications as a mid-range. Sealed basket makes this woofer independent of enclosure design.
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***: 100.9dB
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
Diaphragm 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): 3mm

Mounting Information
Recommended Enclosure Volume
Sealed: N/a
Vented: N/a
Driver Volume Displaced: 35.3 / 0.58 liters
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 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


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