Celestion TF1225
Low frequency
12″ / 305 mm
Nominal diameter
56 Hz
Resonance
0.37
Q factor
95 dB
Sensitivity
± 4.5 mm
Linear excursion
500 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.4
dB
Frequency response
50 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
55.6
Hz
Mechanical quality factor
QMS
3.11
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.37
Large signal parameters
Maximum linear excursion
xmax
4.5
mm
Air volume displaced at xmax
VD
239
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.1
Ω
Inductance (1kHz)
LE
0.86
mH
VC Diameter
64
mm
Winding height
HVC
13
mm
Winding material
Round copper
Former material
Polyimide
Magnet
Force factor
Bl
14.32
N/A
Motor constant
Bl/√RE
6.35
N/√W
Air gap height
HAG
8
mm
Weight
1.2
kg
Material
Ferrite
Diaphragm
Effective diameter
260
mm
Effective area
SD
531
cm²
Moving mass
MMS
48.5
g
Moving mass (without air load)
MMD
39.9
g
Material
Kevlar loaded paper
Suspensions
Stiffness
KMS
5.88
N/mm
Compliance
CMS
170
µm/N
Equivalent volume to the compliance
VAS
67.3
L
Mechanical resistance
RMS
5.45
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
12
″
305
mm
Overall diameter
309
mm
Baffle cutout diameter
283
mm
Overall depth
130
mm
Volume occupied by the driver (estimated)
1.9
L
Net weight
4.1
kg
Frame material
Pressed steel
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12″Low frequency
fS
52 Hz
SD
552 cm²
50 - 3000 Hz
QTS
0.35
xmax
4.8 mm
SPL1W
96 dB
Bl/√RE
7.01
Pmax
1000 W
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12″Subwoofer
fS
57 Hz
SD
550 cm²
65 - 5000 Hz
QTS
0.36
xmax
8.0 mm
SPL1W
96 dB
Bl/√RE
7.44
Pmax
1000 W