18″ / 457 mm
Nominal diameter
37 Hz
Resonance
0.41
Q factor
94 dB
Sensitivity
± 6 mm
Linear excursion
1600 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
Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.2
dB
Frequency response
30 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
37.3
Hz
Mechanical quality factor
QMS
10.25
Electrical quality factor
QES
0.43
Total quality factor
QTS
0.41
Large signal parameters
Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
681
cm³
Power handling
P
800
W
Program power
Pmax
1600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
1.52
mH
VC Diameter
100
mm
Winding height
HVC
22
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
25.12
N/A
Motor constant
Bl/√RE
10.6
N/√W
Air gap height
HAG
10
mm
Weight
3.1
kg
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
206.4
g
Moving mass (without air load)
MMD
179
g
Material
Glass loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
11.36
N/mm
Compliance
CMS
88
µm/N
Equivalent volume to the compliance
VAS
161
L
Mechanical resistance
RMS
4.716
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
462
mm
Baffle cutout diameter
416
mm
Overall depth
205
mm
Volume occupied by the driver (estimated)
5.9
L
Net weight
9.8
kg
Frame material
Cast aluminium
Similar speaker drivers to Celestion FTR18-4080FDX
15″Subwoofer
fS
37 Hz
SD
855 cm²
37 - 3500 Hz
QTS
0.35
xmax
6.0 mm
SPL1W
94 dB
Bl/√RE
7.45
Pmax
1500 W
18″Subwoofer
fS
36 Hz
SD
1164 cm²
35 - 700 Hz
QTS
0.39
xmax
8.0 mm
SPL1W
95 dB
Bl/√RE
10
Pmax
2400 W
18″Subwoofer
fS
38 Hz
SD
1225 cm²
40 - 1000 Hz
QTS
0.40
xmax
9.5 mm
SPL1W
94 dB
Bl/√RE
12
Pmax
2400 W