18″ / 462 mm
Nominal diameter
19 Hz
Resonance
0.32
Q factor
89 dB
Sensitivity
± 12.75 mm
Linear excursion
1800 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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Parts Express
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
88.9
dB
Frequency response
20 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
18.8
Hz
Mechanical quality factor
QMS
4.05
Electrical quality factor
QES
0.35
Total quality factor
QTS
0.32
Large signal parameters
Maximum linear excursion
xmax
12.75
mm
Air volume displaced at xmax
VD
1484
cm³
Power handling
P
900
W
Program power
Pmax
1800
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.2
Ω
Inductance (1kHz)
LE
2.24
mH
VC Diameter
76
mm
Magnet
Force factor
Bl
23.4
N/A
Motor constant
Bl/√RE
13.1
N/√W
Diaphragm
Effective diameter
385
mm
Effective area
SD
1164
cm²
Moving mass
MMS
499
g
Moving mass (without air load)
MMD
470.8
g
Material
Black Anodized Aluminum
Suspensions
Stiffness
KMS
7.14
N/mm
Compliance
CMS
140
µm/N
Equivalent volume to the compliance
VAS
272
L
Mechanical resistance
RMS
14.55
N·s/m
Dimensions
Nominal diameter
18
″
462
mm
Overall diameter
462
mm
Baffle cutout diameter
424
mm
Overall depth
227
mm
Volume occupied by the driver (estimated)
7.6
L
Frame material
Cast Aluminium
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15″Subwoofer
fS
22 Hz
SD
845 cm²
21 - 800 Hz
QTS
0.28
xmax
11.1 mm
SPL1W
91 dB
Bl/√RE
9.32
Pmax
800 W
15″Subwoofer
fS
22 Hz
SD
830 cm²
21 - 600 Hz
QTS
0.32
xmax
12.0 mm
SPL1W
88 dB
Bl/√RE
11
Pmax
1600 W
15″Subwoofer
fS
23 Hz
SD
850 cm²
23 - 1500 Hz
QTS
0.26
xmax
7.0 mm
SPL1W
93 dB
Bl/√RE
9.65
Pmax
600 W