Celestion CF1840JD 1200W 4ohm

Features

- 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

General Specifications

Nominal diameter: 457mm/18in

Power rating(1): 1200Wrms

Nominal impedance: 8ohm

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

Gap depth: 10mm/0.39in

Voice coil winding width: 30mm/1.18in

Xmax(3): 10mm/0.39in

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: 5.29ohm

Vas: 113.924

BI: 24.758Tm

Cms: 0.063mm/N

Rms: 13.653kg/s

Le (at 1kHz): 0.96mH

Mounting Information

Overall 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

(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 2 anechoic environment.

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