18″ / 457 mm
Nominal diameter
28 Hz
Resonance
0.32
Q factor
96 dB
Sensitivity
± 6.7 mm
Linear excursion
1000 W
Program Power
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Parts Express
$$$
Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.9
dB
Frequency response
37 - 200
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
10.38
Electrical quality factor
QES
0.33
Total quality factor
QTS
0.32
Large signal parameters
Maximum linear excursion
xmax
6.7
mm
Maximum excursion before damage
xlim
15.0
mm
Air volume displaced at xmax
VD
796
cm³
Power handling
P
500
W
Program power
Pmax
1000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
3.43
mH
VC Diameter
64
mm
Winding material
Copper
Former material
Polyimide
Magnet
Force factor
Bl
18.9
N/A
Motor constant
Bl/√RE
8.21
N/√W
Air gap height
HAG
9.7
mm
Weight
1.899
kg
Material
Ferrite
Diaphragm
Effective diameter
389
mm
Effective area
SD
1188
cm²
Moving mass
MMS
128
g
Moving mass (without air load)
MMD
99.5
g
Material
Paper
Suspensions
Stiffness
KMS
4.0
N/mm
Compliance
CMS
250
µm/N
Equivalent volume to the compliance
VAS
493
L
Mechanical resistance
RMS
2.17
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
6.01
L
Net weight
7.71
kg
Frame material
Die-cast aluminum
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fS
27 Hz
SD
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35 - 200 Hz
QTS
0.32
xmax
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SPL1W
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Bl/√RE
8.46
Pmax
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fS
28 Hz
SD
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Bl/√RE
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SD
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30 - 1800 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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