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
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
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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
Celestion TF1225 SPL & Impedance
Celestion TF1225 Dimensions

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