Professional Loudspeakers
Your Global Driver Solutions Partner
Celestion International Ltd, Claydon Business Park, Great Blakenham, Ipswich IP6 ONL, UK
Celestion adopts a progressive policy and reserve the right to alter drive unit specifications and/or appearance without prior notice 08/05
TF1225
General Specifications
Nominal diameter (mm/in)...................................... 305/12
Power rating (AES, W rms) ......................................... 250
Nominal impedance (
Ω
) ................................................. 8
Voice coil diameter (mm/in).................................. 63.5/2.5
Magnet type............................................................ Ferrite
Magnet weight (kg/oz)..............................................1.2/42
Chassis type ................................................. Pressed steel
Sensitivity (dB) .............................................................. 97
Frequency range (Hz)........................................... 40-4000
Coil material ............................................... Round copper
Former material .................................................. Polyimide
Cone material ..................................... Kevlar loaded paper
Surround material .......................................... Cloth-sealed
Suspension ............................................................. Single
Xmax (mm/in)...................................................... 2.4/0.09
Gap depth (mm/in)............................................... 8.0/0.31
Voice coil winding width (mm/in) ....................... 12.7/0.50
Small Signal Parameters
D (m/in) .......................................................... 0.26/10.24
Fs(Hz) .......................................................................... 63
Mair (g/oz) ...................................................... 6.91/0.244
Mmd (g/oz) ...................................................... 39.60/1.40
Qms .......................................................................... 6.70
Qes ........................................................................... 0.54
Qts ........................................................................... 0.50
Re(
Ω
) ...................................................................... 5.13
Vas (lt/ft3) .......................................................... 54.5/1.92
Bl (Tm) ................................................................... 13.20
Cms (mm/N) .............................................................. 0.14
Rms (kg/s) ................................................................. 2.76
Le(mH).......................................................................0.84
Mounting Information
Overall diameter (mm/in) .................................. 309/12.17
Overall depth (mm/in).......................................... 130/5.12
Cut-out diameter (mm/in).................................. 283/11.14
Mounting slot dimensions (mm/in)..................... Ø 7.9/0.31
Number of mounting slots ............................................... 4
Mounting PCD range (mm/in) ............................ 297/11.69
Unit weight (kg/lb).................................................. 4.1/9.0
Packed Dimensions & Weight
Single pack size W x D x H (mm/in)...........330 x 330 x 150
............................................................ /13.0 x 13.0 x 5.9
Single pack weight (kg/lb) ........................................ 3/6.6
Multi pack (60) size W x D x H (mm/in) ...... 1080 x 980 x 880
.......................................................... /42.5 x 38.6 x 34.6
Multi pack (60) weight (kg/lb) .............................. 190/419
• Bass and mid range driver that has high sensitivity and excellent
power handling characteristics
• F.E.A (Finite Element Analysis) optimised ferrite magnet design
reduces weight and cost
• Double roll surround for greater excursion control
• For use in 2-way or compact 3-way systems
Frequency Response and Impedance Curves
