Eminence ALPHA-8A
Mid Bass
8″ / 203 mm
Nominal diameter
73 Hz
Resonance
0.59
Q factor
92 dB
Sensitivity
± 3.2 mm
Linear excursion
250 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
91.5
dB
Frequency response
58 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
73.0
Hz
Mechanical quality factor
QMS
4.60
Electrical quality factor
QES
0.68
Total quality factor
QTS
0.59
Large signal parameters
Maximum linear excursion
xmax
3.2
mm
Maximum excursion before damage
xlim
7.1
mm
Air volume displaced at xmax
VD
67
cm³
Power handling
P
125
W
Program power
Pmax
250
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
0.44
mH
VC Diameter
38
mm
Winding material
Copper
Former material
Polyimide
Magnet
Force factor
Bl
7.8
N/A
Motor constant
Bl/√RE
3.39
N/√W
Air gap height
HAG
6.4
mm
Weight
0.567
kg
Material
Ferrite
Diaphragm
Effective diameter
164
mm
Effective area
SD
210
cm²
Moving mass
MMS
17
g
Moving mass (without air load)
MMD
14.7
g
Material
Paper
Suspensions
Stiffness
KMS
3.57
N/mm
Compliance
CMS
280
µm/N
Equivalent volume to the compliance
VAS
17.7
L
Mechanical resistance
RMS
1.7
N·s/m
Surround material
Cloth
Dimensions
Nominal diameter
8
″
203
mm
Overall diameter
209
mm
Baffle cutout diameter
181
mm
Overall depth
83
mm
Volume occupied by the driver
0.58
L
Net weight
1.95
kg
Frame material
Pressed steel
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SpeakerbenchSimilar woofers to Eminence ALPHA-8A
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8″Woofer
fS
73 Hz
SD
230 cm²
60 - 4500 Hz
QTS
0.50
xmax
6.0 mm
SPL1W
93 dB
Bl/√RE
3.51
Pmax
400 W
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8″Woofer
fS
76 Hz
SD
222 cm²
80 - 6300 Hz
QTS
0.52
xmax
5.5 mm
SPL1W
92 dB
Bl/√RE
4.11
Pmax
300 W