Eminence ALPHA 4-8
4Ω
8Ω
Mid-range
4″ / 102 mm
Nominal diameter
123 Hz
Resonance
0.75
Q factor
88 dB
Sensitivity
± 2.6 mm
Linear excursion
110 W
Program Power
![Eminence ALPHA 4-8 Mid-range](/Eminence/Alpha_4-8/Eminence_Alpha_4-8_(Photo).jpg)
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- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 88.1
- dB
- Frequency response
- 105 - 12000
- Hz
- Resonance frequency (free air)
- fS
- 123
- Hz
- Mechanical quality factor
- QMS
- 6.83
- Electrical quality factor
- QES
- 0.84
- Total quality factor
- QTS
- 0.75
- Maximum linear excursion
- xmax
- 2.6
- mm
- Maximum excursion before damage
- xlim
- 4.5
- mm
- Air volume displaced at xmax
- VD
- 15
- cm³
- Power handling
- P
- 55
- W
- Program power
- Pmax
- 110
- W
- Nominal impedance
- Z
- 8
- Ω
- DC resistance
- RE
- 6.7
- Ω
- Inductance (1kHz)
- LE
- 0.28
- mH
- VC Diameter
- 25
- mm
- Winding material
- Copper
- Former material
- Polyimide
- Force factor
- Bl
- 4.94
- N/A
- Motor constant
- Bl/√RE
- 1.9
- N/√W
- Air gap height
- HAG
- 3.7
- mm
- Weight
- 0.283
- kg
- Material
- Ferrite
- Effective diameter
- 86
- mm
- Effective area
- SD
- 58
- cm²
- Moving mass
- MMS
- 4
- g
- Moving mass (without air load)
- MMD
- 3.7
- g
- Material
- Paper
- Stiffness
- KMS
- 2.38
- N/mm
- Compliance
- CMS
- 420
- µm/N
- Equivalent volume to the compliance
- VAS
- 1.94
- L
- Mechanical resistance
- RMS
- 0.45
- N·s/m
- Surround material
- Cloth
- Nominal diameter
- 4
- ″
- 102
- mm
- Overall diameter
- 116
- mm
- Baffle cutout diameter
- 96
- mm
- Overall depth
- 59
- mm
- Volume occupied by the driver
- 0.33
- L
- Net weight
- 0.68
- kg
- Frame material
- Pressed steel
Available on (affiliate links)
Specifications
Thiele & Small parameters
Large signal parameters
Voice Coil
Magnet
Diaphragm
Suspensions
Dimensions
![Eminence ALPHA 4-8 SPL & Impedance](/Eminence/Alpha_4-8/Eminence_Alpha_4-8_(Frequency_response_+_Impedance).png)
Export this driver to a simulation software:
![WinISD](/images/export/WinISD.png)
![Basta!](/images/export/Basta.png)
![Hornresp](/images/export/Hornresp.png)
![QSpeakers](/images/export/QSpeakers.png)
![SpeakerSim](/images/export/SpeakerSim.png)
![MfbLabs](/images/export/MfbLabs.png)
![Speakerbench](/images/export/Speakerbench.png)