18″ / 462 mm
Nominal diameter
38 Hz
Resonance
0.28
Q factor
96 dB
Sensitivity
± 14 mm
Linear excursion
3600 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
96.3
dB
Frequency response
30 - 2300
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
38.0
Hz
Mechanical quality factor
QMS
6.00
Electrical quality factor
QES
0.29
Total quality factor
QTS
0.28
Large signal parameters
Maximum linear excursion
xmax
14.0
mm
Air volume displaced at xmax
VD
1813
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
2.7
Ω
Inductance (1kHz)
LE
1.53
mH
VC Diameter
135
mm
Magnet
Force factor
Bl
25.0
N/A
Motor constant
Bl/√RE
15.2
N/√W
Diaphragm
Effective diameter
406
mm
Effective area
SD
1295
cm²
Moving mass
MMS
255
g
Moving mass (without air load)
MMD
223.5
g
Suspensions
Stiffness
KMS
14.49
N/mm
Compliance
CMS
69
µm/N
Equivalent volume to the compliance
VAS
111
L
Mechanical resistance
RMS
10.15
N·s/m
Dimensions
Nominal diameter
18
″
462
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)
7.7
L
Net weight
12.8
kg
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18″Subwoofer
fS
33 Hz
SD
1164 cm²
30 - 500 Hz
QTS
0.24
xmax
11.0 mm
SPL1W
97 dB
Bl/√RE
14
Pmax
2000 W
15″Woofer
fS
41 Hz
SD
866 cm²
40 - 3000 Hz
QTS
0.29
xmax
6.5 mm
SPL1W
96 dB
Bl/√RE
9.68
Pmax
1600 W
21″Subwoofer
fS
37 Hz
SD
1662 cm²
25 - 2000 Hz
QTS
0.29
xmax
14.0 mm
SPL1W
96 dB
Bl/√RE
18
Pmax
3600 W