Eminence SIGMA PRO 18A-2
Subwoofer
18″ / 457 mm
Nominal diameter
28 Hz
Resonance
0.29
Q factor
96 dB
Sensitivity
± 6.1 mm
Linear excursion
1300 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.2
dB
Frequency response
41 - 2400
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
8.28
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
6.1
mm
Maximum excursion before damage
xlim
18.0
mm
Air volume displaced at xmax
VD
695
cm³
Power handling
P
650
W
Program power
Pmax
1300
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.3
Ω
Inductance (1kHz)
LE
1.9
mH
VC Diameter
76
mm
Winding material
Copper
Former material
Polyimide
Magnet
Force factor
Bl
22.1
N/A
Motor constant
Bl/√RE
8.81
N/√W
Air gap height
HAG
9.5
mm
Weight
3.402
kg
Material
Ferrite
Diaphragm
Effective diameter
381
mm
Effective area
SD
1140
cm²
Moving mass
MMS
130
g
Moving mass (without air load)
MMD
102.7
g
Material
Paper
Suspensions
Stiffness
KMS
4.17
N/mm
Compliance
CMS
240
µm/N
Equivalent volume to the compliance
VAS
441
L
Mechanical resistance
RMS
2.76
N·s/m
Surround material
Cloth
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
457
mm
Baffle cutout diameter
421
mm
Overall depth
207
mm
Volume occupied by the driver
6.62
L
Net weight
11.11
kg
Frame material
Die-cast aluminum
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