18″ / 460 mm
Nominal diameter
30 Hz
Resonance
0.24
Q factor
96 dB
Sensitivity
± 8 mm
Linear excursion
1400 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.2
dB
Frequency response
40 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
8.80
Electrical quality factor
QES
0.25
Total quality factor
QTS
0.24
Large signal parameters
Maximum linear excursion
xmax
8.0
mm
Air volume displaced at xmax
VD
907
cm³
Power handling
P
700
W
Program power
Pmax
1400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
2.1
mH
VC Diameter
100
mm
Winding height
HVC
21
mm
Former material
Glass Fibre
Magnet
Flux density
B
1.15
T
Force factor
Bl
26.0
N/A
Motor constant
Bl/√RE
11.3
N/√W
Air gap height
HAG
8
mm
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
170
g
Moving mass (without air load)
MMD
141.7
g
Suspensions
Stiffness
KMS
6.14
N/mm
Compliance
CMS
163
µm/N
Equivalent volume to the compliance
VAS
297
L
Mechanical resistance
RMS
3.64
N·s/m
Spider material
Double Silicone
Dimensions
Nominal diameter
18
″
460
mm
Overall diameter
480
mm
Baffle cutout diameter
422
mm
Overall depth
202
mm
Flange thickness
16
mm
Mounting depth
186
mm
Volume occupied by the driver
9.5
L
Net weight
12.1
kg
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fS
33 Hz
SD
1225 cm²
30 - 2500 Hz
QTS
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xmax
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Bl/√RE
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Pmax
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18″Woofer
fS
32 Hz
SD
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30 - 1000 Hz
QTS
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fS
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SD
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QTS
0.22
xmax
9.5 mm
SPL1W
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Bl/√RE
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Pmax
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