Eighteen Sound 18iDSDS
Subwoofer
18″ / 462 mm
Nominal diameter
29 Hz
Resonance
0.17
Q factor
94 dB
Sensitivity
± 18 mm
Linear excursion
3600 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.4
dB
Frequency response
29 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
29.0
Hz
Mechanical quality factor
QMS
7.00
Electrical quality factor
QES
0.18
Total quality factor
QTS
0.17
Large signal parameters
Maximum linear excursion
xmax
18.0
mm
Air volume displaced at xmax
VD
2205
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
2
Ω
DC resistance
RE
1.3
Ω
Inductance (1kHz)
LE
0.93
mH
VC Diameter
135
mm
Winding height
HVC
45
mm
Winding material
Aluminum
Magnet
Force factor
Bl
24.4
N/A
Motor constant
Bl/√RE
21.4
N/√W
Air gap height
HAG
18
mm
Material
Neodymium
Diaphragm
Effective diameter
395
mm
Effective area
SD
1225
cm²
Moving mass
MMS
444
g
Moving mass (without air load)
MMD
414.3
g
Material
Reinforced, water repellent
Suspensions
Stiffness
KMS
14.71
N/mm
Compliance
CMS
68
µm/N
Equivalent volume to the compliance
VAS
136
L
Mechanical resistance
RMS
11.56
N·s/m
Spider material
Double Silicon
Dimensions
Nominal diameter
18
″
462
mm
Overall diameter
462
mm
Baffle cutout diameter
417
mm
Overall depth
238
mm
Flange thickness
24
mm
Mounting depth
214
mm
Volume occupied by the driver (estimated)
8.9
L
Net weight
16.0
kg
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fS
29 Hz
SD
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29 - 1000 Hz
QTS
0.17
xmax
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SPL1W
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Bl/√RE
21
Pmax
3600 W
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fS
30 Hz
SD
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fS
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SD
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35 - 1000 Hz
QTS
0.17
xmax
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SPL1W
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