Eminence BETA-8A
Mid Bass
8″ / 203 mm
Nominal diameter
65 Hz
Resonance
0.38
Q factor
93 dB
Sensitivity
± 3 mm
Linear excursion
450 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.2
dB
Frequency response
78 - 4500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
65.0
Hz
Mechanical quality factor
QMS
4.95
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.38
Large signal parameters
Maximum linear excursion
xmax
3.0
mm
Maximum excursion before damage
xlim
7.4
mm
Air volume displaced at xmax
VD
63
cm³
Power handling
P
225
W
Program power
Pmax
450
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz)
LE
0.49
mH
VC Diameter
51
mm
Winding material
Aluminum
Former material
Polyimide
Magnet
Force factor
Bl
9.6
N/A
Motor constant
Bl/√RE
3.92
N/√W
Air gap height
HAG
7.9
mm
Weight
0.964
kg
Material
Ferrite
Diaphragm
Effective diameter
164
mm
Effective area
SD
210
cm²
Moving mass
MMS
16
g
Moving mass (without air load)
MMD
13.7
g
Material
Paper
Suspensions
Stiffness
KMS
2.7
N/mm
Compliance
CMS
370
µm/N
Equivalent volume to the compliance
VAS
23.3
L
Mechanical resistance
RMS
1.32
N·s/m
Surround material
Cloth
Dimensions
Nominal diameter
8
″
203
mm
Overall diameter
209
mm
Baffle cutout diameter
181
mm
Overall depth
89
mm
Volume occupied by the driver
0.76
L
Net weight
2.99
kg
Frame material
Pressed steel
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SD
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60 - 5500 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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Pmax
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SD
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70 - 4000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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