Celestion LF Cast Chassis Ferrite CF1840JD

* 18" ferrite magnet, cast aluminium chassis LF driver delivering 1200Wrms (AES Standard) power handling and 98dB sensitivity

* 4" high temperature, dual layer, Inside/Outside voice coil for higher efficiency, preventing sensitivity loss through thermal compression

* FEA optimized magnet assembly and suspension deliver highly symmetrical cone movement, leading to exceptionally low harmonic distortion

* Vented magnet assembly increases airflow to provide enhanced cooling

* Twin demodulation rings reduce flux modulation, minimizing electromagnetic distortion

* Double suspension and "multi-roll" surround provide exceptional linearity at extremes of cone excursion

8 Ohm Frequency Response

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. Measured on axis at 1W, 1m in 2p anechoic environment.

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


* Nominal diameter 457mm/18in

* Power rating (1) 1200Wrms

* Nominal impedance 8 Ohm

* Sensitivity (2) 98dB

* Frequency range 30-2500Hz

* Voice coil diameter 100mm/4in

* Chassis type Cast aluminium

* Magnet type Ferrite

* Magnet weight 3.18kg/112oz

* Coil material Round copper

* Former material Glass fibre

* Cone material Kevlar loaded paper

* Surround material Cloth-sealed

* Suspension Double

* Xmax (3) 10mm/0.39in

* Gap depth 10mm/0.39in

* Voice coil winding width 30mm/1.18in

Small Signal Parameters

* D 0.38m/14.96in

* Fs 44.2Hz

* Mms 215.15g/7.59oz

* Qms 4.21

* Qes 0.496

* Mmd 185.145g/6.54oz

* Qts 0.444

* Re 5.29O

* Vas 113.924

* BI 24.758Tm

* Cms 0.063mm/N

* Rms 13.653kg/s

* Le (at 1kHz) 0.96mH

Mounting Information

* Diameter 460mm/18.11in

* Overall depth 220.35mm/8.68in

* Cut-out diameter 414mm/16.3in

* Mounting slot dimensions 11mm x 7mm/0.43-0.28in

* Number of mounting slots 8

* Mounting PCD range 441-432mm/17.36-17.01in

* Unit weight 11.6kg/25.5lb