Eminence SIGMA PRO 18-4
Subwoofer
18″ / 457 mm
Nominal diameter
32 Hz
Resonance
0.29
Q factor
97 dB
Sensitivity
± 7 mm
Linear excursion
1400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.1
dB
Frequency response
32 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
32.0
Hz
Mechanical quality factor
QMS
14.79
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
7.0
mm
Maximum excursion before damage
xlim
18.0
mm
Air volume displaced at xmax
VD
798
cm³
Power handling
P
700
W
Program power
Pmax
1400
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.4
Ω
Inductance (1kHz)
LE
0.85
mH
VC Diameter
76
mm
Winding material
Copper
Former material
Polyimide
Magnet
Force factor
Bl
16.54
N/A
Motor constant
Bl/√RE
9.04
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
121
g
Moving mass (without air load)
MMD
93.7
g
Material
Paper
Suspensions
Stiffness
KMS
5.0
N/mm
Compliance
CMS
200
µm/N
Equivalent volume to the compliance
VAS
361
L
Mechanical resistance
RMS
1.64
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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SD
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