Eminence ALPHA 3-8

Full-range

3″ / 76 mm
Nominal diameter
118 Hz
Resonance
0.5
Q factor
87 dB
Sensitivity
± 2.4 mm
Linear excursion
60 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply

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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
87.1
dB
Frequency response
150 - 20000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
118
Hz
Mechanical quality factor
QMS
7.94
Electrical quality factor
QES
0.53
Total quality factor
QTS
0.50

Large signal parameters

Maximum linear excursion
xmax
2.4
mm
Maximum excursion before damage
xlim
4.0
mm
Air volume displaced at xmax
VD
6.9
cm³
Power handling
P
30
W
Program power
Pmax
60
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.1
Ω
Inductance (1kHz)
LE
0.11
mH
VC Diameter
20
mm
Winding material
Copper
Former material
Polyimide

Magnet

Force factor
Bl
3.93
N/A
Motor constant
Bl/√RE
1.74
N/√W
Air gap height
HAG
2.5
mm
Weight
0.227
kg
Material
Ferrite

Diaphragm

Effective diameter
60
mm
Effective area
SD
29
cm²
Moving mass
MMS
2
g
Moving mass (without air load)
MMD
1.9
g
Material
Paper/Poly sandwich

Suspensions

Stiffness
KMS
1.19
N/mm
Compliance
CMS
840
µm/N
Equivalent volume to the compliance
VAS
0.95
L
Mechanical resistance
RMS
0.19
N·s/m
Surround material
Poly

Dimensions

Nominal diameter
3
76
mm
Overall diameter
101
mm
Baffle cutout diameter
77
mm
Overall depth
45
mm
Volume occupied by the driver
0.13
L
Net weight
0.41
kg
Frame material
Pressed steel
Eminence ALPHA 3-8 SPL & Impedance

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