Eminence Alpha 4 Speaker (55 Watts, 4")

- Nominal Basket Diameter: 4", 102 mm
- Nominal Impedance: 4 ohms or 8 ohms
- 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: 0.14", 3.7 mm
- Voice Coil Diameter: 1", 25 mm
- Resonant Frequency (fs): 123 Hz
- DC Resistance (Re): 6.73 O
- 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
- 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
- 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
- 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
Dimensions and Weight in Packaging
4 Ohms, Pair
Shipping Weight: 3.25 lbs
Shipping Dimensions: 6 x 6 x 5 in
Manufacturer Part Number (MPN): ALPHA 4-4
8 Ohms, Pair
Shipping Weight: 3.25 lbs
Shipping Dimensions: 5 x 5 x 5 in
Manufacturer Part Number (MPN): ALPHA 4-8
If you have additional warranty questions, please contact the manufacturer at 502-845-5622
(1 ratings)
Submitted July 25, 2017 by John M in North Fort Myers, FL
"Upgrade +"
Verified Customer zZounds has verified that this reviewer made a purchase from us.
Okay, so I got this little Boss solid state practice amp, an "MG 10." The floppy little radio speakers sounded okay, but I wanted more....seeing this as a "blues harp" amplifier, I purchased the pair of Eminence Alpha 4 speakers for $30. I put them into a 1/2" wood baffle on the front, (now it looks like a vintage Crate), and wired them to produce an 8 ohm load. Safely I say, these beefy little monsters sound loud, clear, and fabulous for my purpose, but also excel as an acoustic amp for my Epiphone EJ200 acoustic-electric guitar. If you want to build a "PA array" type of cabinet with 4, 6, or 8 of these solid frames on each side, you may be challenging the Bose products for quality of sound in a very direct way. I highly recommend for guitar, harmonica, and vocals.
Musical Background:
Weekend warrior...different instruments....a few decades.
Musical Style:
classic rock, blues, country, pop, and yes, Christian.
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