LF Cast Chassis / Ferrite

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CF1840JD

CF1840JD
CF1840JD

  • 18" ferrite magnet, cast aluminium chassis LF driver delivering 1000Wrms (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

8Ω Frequency Response

Product Graph
  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 2π anechoic environment.
  3. Xmax derived from: (voice coil winding width-gap depth)/2.

General Specifications

Nominal diameter
457mm/18in
Power rating1
1000Wrms
Nominal impedance
Sensitivity2
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
Xmax3
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
Mmd
185.145g/6.54oz
Qms
4.21
Qes
0.496
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

Diameter
460mm/18.11in
Overall depth
220.35mm/8.68in
Cut-out diameter
412.6mm/16.24in
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