Celestion TF1225 250W 8OHM LF FERRITE
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Celestion - TF1225 250W 8ohm - LF Pressed Steel Chassis Loudspeaker - Ferrite


- 12" Bass and mid-range driver providing 97dB sensitivity and 250Wrms (AES standard) power handling

- 2.5" high temperature copper voice coil wound on polyimide for increased reliability

- Optimised ferrite magnet design reduces weight

- Double roll surround for greater excursion control

- For use in 2-way or compact 3-way systems

General Specifications

Nominal diameter: 305mm/12in

Power rating(1): 250Wrms

Continuous power rating(2): 500W

EIA power rating(3): 400W

Nominal impedance: 8ohm

Sensitivity(4): 97dB

Frequency range: 50-4000Hz

Voice coil diameter: 64mm/2.5in

Chassis type: Pressed steel

Magnet type: Ferrite

Magnet weight: 1.2kg/42oz

Coil material: Round copper

Former material: Polyimide

Cone material: Kevlar loaded paper

Surround material: Cloth-sealed

Suspension: Single

Xmax(5): 2.5mm/0.1in

Gap depth: 8mm/0.31in

Voice coil winding width: 13mm/0.51in

Small Signal Parameters

D: 0.26m/10.24in

Fs: 63Hz

Mms: 46.51g/1.64oz

Qms: 6.70

Qes: 0.54

Mmd: 39.60g/1.40oz

Qts: 0.50

Re: 5.13ohm

Vas: 54.5lt/1.92ft3

BI: 13.20Tm

Cms: 0.14mm/N

Rms: 2.76kg/s

Le (at 1kHz): 0.84mH

Mounting Information

Overall diameter: 309mm/12.17in

Overall depth: 130mm/5.12in

Cut-out diameter: 283mm/11.14in

Mounting slot dimensions: Ø 7.9/0.31

Number of mounting slots: 4

Mounting PCD range: 297mm/11.69in

Unit weight: 4.1kg/9.0lb


(1)Tested for two hours using a continuous, band-limited pink noise signal as per AES standard. Power calculated on minimum impedance. Loudspeaker tested in free air.

(2)Continuous Power Handling is defined as 3dB greater than the AES rating.

(3)Tested as per the EIA-426-A standard.

(4)Measured on axis at 1W, 1m in 2pi anechoic environment.

(5)Xmax derived from: (voice coil winding width-gap depth)/2.

(6)Small signal parameters measured after unit subjected to pre-conditioning signal.

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