Celestion TF1830

Low frequency

18″ / 457 mm
Nominal diameter
36 Hz
Resonance
0.39
Q factor
94 dB
Sensitivity
± 4.5 mm
Linear excursion
1000 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
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
94.4
dB
Frequency response
35 - 1000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
35.7
Hz
Mechanical quality factor
QMS
4.21
Electrical quality factor
QES
0.43
Total quality factor
QTS
0.39

Large signal parameters

Maximum linear excursion
xmax
4.5
mm
Air volume displaced at xmax
VD
510
cm³
Power handling
P
500
W
Program power
Pmax
1000
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
2.6
Ω
Inductance (1kHz)
LE
1.28
mH
VC Diameter
75
mm
Winding height
HVC
17
mm
Winding material
Round copper
Former material
Glass Fibre

Magnet

Force factor
Bl
15.46
N/A
Motor constant
Bl/√RE
9.62
N/√W
Air gap height
HAG
8
mm
Weight
1.8
kg
Material
Ferrite

Diaphragm

Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
179.1
g
Moving mass (without air load)
MMD
151.8
g
Material
Glass loaded paper (weather-resistant)

Suspensions

Stiffness
KMS
9.09
N/mm
Compliance
CMS
110
µm/N
Equivalent volume to the compliance
VAS
202
L
Mechanical resistance
RMS
9.53
N·s/m
Surround material
Cloth-sealed

Dimensions

Nominal diameter
18
457
mm
Overall diameter
460
mm
Baffle cutout diameter
421
mm
Overall depth
209
mm
Volume occupied by the driver (estimated)
5.0
L
Net weight
7.5
kg
Frame material
Pressed steel
Celestion TF1830 SPL & Impedance

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