The Celestion CF1840JD is a versatile ferrite magnet subwoofer suitable for reflex, scoop or horn loaded use.

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

Used by DB to replace the 18TBX100.

Superb Spec

General Specifications

Nominal diameter 457mm/18in
Power rating 1200Wrms
Nominal impedance 8Ω
Sensitivity 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 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 5.29Ω
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 

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