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- Eminence Alpha 3 - 8 ohm 3" 30W Fullrange Line Array Speaker
Eminence Alpha 3 - 8 ohm 3" 30W Fullrange Line Array Speaker
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A truly versatile compact full-range driver perfectly suited for tight fitting pro audio line array and column array applications. An 8.3 oz ferrite magnet used in conjunction with an internal neodymium bucking magnet increases the sensitivity and extends the response out to 20kHz. The highly pressed cone sandwiches paper with a layer of water-resistant polypropylene for increased stiffness and lower distortion.
Specifications | |
| Nominal Basket Diameter | 3", 76 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating* | Program Power | 60 W |
| Watts | 30 W |
| Resonance | 118 Hz |
| Usable Frequency Range | 150 Hz - 20 kHz |
| Sensitivity* | 88.6 dB |
| Magnet Weight | 8 oz. |
| Gap Height | 0.1", 2.5 mm |
| Voice Coil Diameter | 0.787", 20 mm |
T/S Parameters | |
| Resonant Frequency (fs) | 118 Hz |
| DC Resistance (Re) | 5.12 Ω |
| Coil Inductance (Le) | 0.11m H |
| Mechanical Q (Qms) | 7.94 |
| Electromagnetic Q (Qes) | 0.53 |
| Total Q (Qts) | 0.5 |
| Compliance Equivalent Volume (Vas) | 0.95 liters / 0.03 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 6.9 cc |
| Mechanical Compliance of Suspension (Cms) | 0.84 mm/N |
| BL Product (BL) | 3.93 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 2 grams |
| Efficiency Bandwidth Product (EBP) | 220 |
| Maximum Linear Excursion (Xmax) | 2.4 mm |
| Surface Area of Cone (Sd) | 28.6 cm2 |
| Maximum Mechanical Limit (Xlim) | 4 mm |
Mounting Information | |
| Recommended Enclosure Volume | |
| Sealed | 0.85-1.42 liters / 0.03-0.05 cu.ft. |
| Vented | 1.42-1.98 liters / 0.05-0.07 cu.ft. |
| Driver Volume Displaced | 0.005 cu.ft. / 0.13 liters |
| Major Diameter | 3.98", 101.1 mm |
| Flat to Flat Diameter | 3.24", 82.3 mm |
| Baffle Hole Diameter | 3.04", 77.2 mm |
| Front Sealing Gasket | Yes |
| Rear Sealing Gasket | Yes |
| Mounting Holes Diameter | 0.16", 4.1mm |
| Mounting Holes B.C.D. | 3.63", 92.1mm |
| Depth | 1.76", 44.6 mm |
| Net Weight | 0.9 lbs, 0.41 kg |
| Shipping Weight | 1.1 lbs, 0.5 kgs |
Construction | |
| Coil Construction | Copper voice coil |
| Coil Former | Polyimide former |
| Magnet Composition | Ferrite magnet |
| Core Details | Vented / Flux source cap |
| Basket Materials | Pressed steel |
| Cone Composition | Paper / Poly sandwich cone |
| Cone Edge Composition | Poly cone edge |
| Dust Cap Composition | Poly dust cap |
Customer Reviews
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Author: Peter
I used these as midrange drivers in a 3-way home speaker system crossed at 1000 Hz and 3500 Hz with excellent results! I made separate enclosure of 0.6 litres volume for them. The crossover network is first order, and at first something sounded out of phase. I reversed the polarity on this driver and the speaker came to life. I wasn't expecting that with a first order crossover. Maybe there was a phase shift, or the polarity was incorrectly labelled on the drivers I received? Not sure, but something to look out for when working with these. Excellent build quality and sound quality. I'm very happy with these and definitely recommend them as midrange drivers.
