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
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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
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3.3″Full-range
fS
125 Hz
SD
29 cm²
100 - 20000 Hz
QTS
0.49
SPL1W
87 dB
Bl/√RE
1.49
Pmax
50 W
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3″Full-range
fS
133 Hz
SD
30 cm²
135 - 20000 Hz
QTS
0.51
xmax
2.0 mm
SPL1W
87 dB
Bl/√RE
1.87
Pmax
60 W
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4″Woofer
fS
118 Hz
SD
44 cm²
120 - 10000 Hz
QTS
0.39
xmax
2.2 mm
SPL1W
88 dB
Bl/√RE
2.43
Pmax
140 W