Eminence BETA-12A-2
Bass Guitar Speaker
12″ / 305 mm
Nominal diameter
47 Hz
Resonance
0.46
Q factor
95 dB
Sensitivity
± 4.4 mm
Linear excursion
500 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.1
dB
Frequency response
43 - 3800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
47.0
Hz
Mechanical quality factor
QMS
6.00
Electrical quality factor
QES
0.50
Total quality factor
QTS
0.46
Large signal parameters
Maximum linear excursion
xmax
4.4
mm
Maximum excursion before damage
xlim
11.0
mm
Air volume displaced at xmax
VD
237
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
0.64
mH
VC Diameter
51
mm
Winding material
Copper
Former material
Polyimide
Magnet
Force factor
Bl
10.8
N/A
Motor constant
Bl/√RE
4.83
N/√W
Air gap height
HAG
7.9
mm
Weight
1.077
kg
Material
Ferrite
Diaphragm
Effective diameter
262
mm
Effective area
SD
539
cm²
Moving mass
MMS
40
g
Moving mass (without air load)
MMD
31.3
g
Material
Paper
Suspensions
Stiffness
KMS
3.45
N/mm
Compliance
CMS
290
µm/N
Equivalent volume to the compliance
VAS
120
L
Mechanical resistance
RMS
1.97
N·s/m
Surround material
Cloth
Dimensions
Nominal diameter
12
″
305
mm
Overall diameter
306
mm
Baffle cutout diameter
281
mm
Overall depth
140
mm
Volume occupied by the driver
2.0
L
Net weight
3.4
kg
Frame material
Pressed steel
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SD
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