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
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
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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
Eminence BETA-12A-2 SPL & Impedance

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