Eighteen Sound 18iD
Subwoofer
18″ / 460 mm
Nominal diameter
40 Hz
Resonance
0.26
Q factor
94 dB
Sensitivity
± 15.5 mm
Linear excursion
3600 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.1
dB
Frequency response
30 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
40.0
Hz
Mechanical quality factor
QMS
5.50
Electrical quality factor
QES
0.27
Total quality factor
QTS
0.26
Large signal parameters
Maximum linear excursion
xmax
15.5
mm
Air volume displaced at xmax
VD
1899
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
2
Ω
DC resistance
RE
1.5
Ω
Inductance (1kHz)
LE
1.22
mH
VC Diameter
135
mm
Winding material
Copper
Magnet
Force factor
Bl
24.0
N/A
Motor constant
Bl/√RE
19.6
N/√W
Material
Neodymium
Diaphragm
Effective diameter
395
mm
Effective area
SD
1225
cm²
Moving mass
MMS
420
g
Moving mass (without air load)
MMD
390.3
g
Material
Water,UV repellent
Suspensions
Stiffness
KMS
26.32
N/mm
Compliance
CMS
38
µm/N
Equivalent volume to the compliance
VAS
67
L
Mechanical resistance
RMS
19.19
N·s/m
Dimensions
Nominal diameter
18
″
460
mm
Overall diameter
462
mm
Baffle cutout diameter
416
mm
Overall depth
236
mm
Flange thickness
26
mm
Mounting depth
210
mm
Volume occupied by the driver (estimated)
7.6
L
Net weight
12.5
kg
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SD
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SD
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