Eminence ALPHA-15A

Bass Guitar Speaker

15″ / 381 mm
Nominal diameter
41 Hz
Resonance
1.26
Q factor
94 dB
Sensitivity
± 3.8 mm
Linear excursion
400 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
94.3
dB
Frequency response
46 - 3500
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
41.0
Hz
Mechanical quality factor
QMS
7.23
Electrical quality factor
QES
1.53
Total quality factor
QTS
1.26

Large signal parameters

Maximum linear excursion
xmax
3.8
mm
Maximum excursion before damage
xlim
8.4
mm
Air volume displaced at xmax
VD
325
cm³
Power handling
P
200
W
Program power
Pmax
400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz)
LE
0.84
mH
VC Diameter
38
mm
Winding material
Copper
Former material
Polyimide

Magnet

Force factor
Bl
7.7
N/A
Motor constant
Bl/√RE
3.18
N/√W
Air gap height
HAG
6.4
mm
Weight
0.709
kg
Material
Ferrite

Diaphragm

Effective diameter
330
mm
Effective area
SD
856
cm²
Moving mass
MMS
59
g
Moving mass (without air load)
MMD
41.7
g
Material
Paper

Suspensions

Stiffness
KMS
4.0
N/mm
Compliance
CMS
250
µm/N
Equivalent volume to the compliance
VAS
260
L
Mechanical resistance
RMS
2.1
N·s/m
Surround material
Cloth

Dimensions

Nominal diameter
15
381
mm
Overall diameter
385
mm
Baffle cutout diameter
352
mm
Overall depth
148
mm
Volume occupied by the driver
3.21
L
Net weight
3.04
kg
Frame material
Pressed steel
Eminence ALPHA-15A SPL & Impedance

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