Eminence ALPHA 2-8

Full-range

2″ / 51 mm
Nominal diameter
186 Hz
Resonance
0.72
Q factor
82 dB
Sensitivity
± 1.7 mm
Linear excursion
30 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
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
81.5
dB
Frequency response
200 - 20000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
186
Hz
Mechanical quality factor
QMS
3.06
Electrical quality factor
QES
0.94
Total quality factor
QTS
0.72

Large signal parameters

Maximum linear excursion
xmax
1.7
mm
Maximum excursion before damage
xlim
2.2
mm
Air volume displaced at xmax
VD
2.1
cm³
Power handling
P
20
W
Program power
Pmax
30
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
6.4
Ω
Inductance (1kHz)
LE
0.13
mH
VC Diameter
16
mm
Winding material
Copper
Former material
Polyimide

Magnet

Force factor
Bl
2.64
N/A
Motor constant
Bl/√RE
1.04
N/√W
Air gap height
HAG
3
mm
Weight
0.085
kg

Diaphragm

Effective diameter
40
mm
Effective area
SD
12
cm²
Moving mass
MMS
1
g
Moving mass (without air load)
MMD
1
g

Suspensions

Stiffness
KMS
1.19
N/mm
Compliance
CMS
840
µm/N
Equivalent volume to the compliance
VAS
0.18
L
Mechanical resistance
RMS
0.38
N·s/m
Surround material
Paper/Poly Sandwich

Dimensions

Nominal diameter
2
51
mm
Overall diameter
54
mm
Baffle cutout diameter
51
mm
Volume occupied by the driver
0.03
L
Net weight
0.18
kg
Frame material
Pressed steel
Eminence ALPHA 2-8 SPL & Impedance

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