Eminence ALPHA 2-8
Full-range
2″ / 51 mm
Nominal diameter
186 Hz
Resonance
0.72
Q factor
82 dB
Sensitivity
± 1.7 mm
Linear excursion
30 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
81.5
dB
Frequency response
200 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
186
Hz
Mechanical quality factor
QMS
3.06
Electrical quality factor
QES
0.94
Total quality factor
QTS
0.72
Large signal parameters
Maximum linear excursion
xmax
1.7
mm
Maximum excursion before damage
xlim
2.2
mm
Air volume displaced at xmax
VD
2.1
cm³
Power handling
P
20
W
Program power
Pmax
30
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.4
Ω
Inductance (1kHz)
LE
0.13
mH
VC Diameter
16
mm
Winding material
Copper
Former material
Polyimide
Magnet
Force factor
Bl
2.64
N/A
Motor constant
Bl/√RE
1.04
N/√W
Air gap height
HAG
3
mm
Weight
0.085
kg
Diaphragm
Effective diameter
40
mm
Effective area
SD
12
cm²
Moving mass
MMS
1
g
Moving mass (without air load)
MMD
1
g
Suspensions
Stiffness
KMS
1.19
N/mm
Compliance
CMS
840
µm/N
Equivalent volume to the compliance
VAS
0.18
L
Mechanical resistance
RMS
0.38
N·s/m
Surround material
Paper/Poly Sandwich
Dimensions
Nominal diameter
2
″
51
mm
Overall diameter
54
mm
Baffle cutout diameter
51
mm
Volume occupied by the driver
0.03
L
Net weight
0.18
kg
Frame material
Pressed steel
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SpeakerbenchSimilar speaker drivers to Eminence ALPHA 2-8
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2″Full-range
fS
177 Hz
SD
15 cm²
130 - 10000 Hz
QTS
0.69
xmax
2.1 mm
SPL1W
82 dB
Bl/√RE
1.37
Pmax
30 W
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2″Full-range
fS
180 Hz
SD
15 cm²
100 - 19000 Hz
QTS
0.72
xmax
2.7 mm
SPL1W
83 dB
Bl/√RE
1.53
Pmax
50 W
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2″Full-range
fS
164 Hz
SD
13 cm²
120 - 20000 Hz
QTS
0.59
xmax
0.9 mm
SPL1W
82 dB
Bl/√RE
1.38
Pmax
10 W