CF1840JD
18-inch, cast aluminium chassis, ferrite magnet LF driver
- Balanced airflow venting provides enhanced cooling
- Twin demodulation rings
- Optimised double suspension
Specifications
2400W
Continuous power rating
97dB
Sensitivity
4in
Voice coil diameter
Nominal diameter
457mm / 18in
Power rating
1200W
Continuous power rating
2400W
Rated impedance
8Ω
Sensitivity
97dB
Frequency range
30-2500Hz
Chassis type
Cast aluminium
Magnet type
Ferrite
Magnet weight
3.18kg / 112oz
Voice coil diameter
100mm / 4in
Voice coil material
Round copper
Former material
Glass fibre
Cone material
Kevlar loaded paper
Surround material
Cloth-sealed
Suspension
Double
Gap height (Hg)
10mm / 0.39in
VC winding height (Hvc)
30mm / 1.18in
Additional impedances
4Ω
Parameters
Sd
1134.12cm2 / 175.79in2
Fs
37.00Hz
Mms
217.40g / 7.67oz
Qms
4.372
Qes
0.437
Qts
0.397
Re
5.29Ω
Vas
155l / 5.47ft3
BI
24.76Tm
Cms
0.09mm/N
Rms
11.56kg/s
Le (at 1kHz)
1.16mH
Xmax
12.5mm / 0.49in
Mounting Information
Overall diameter
460mm / 18.11in
Overall depth
220mm / 8.7in
Cut-out diameter
414mm / 16.24in
Mounting hole dimensions
11x7mm / 0.43x0.28in
Number of mounting holes
8
Mounting hole PCD
441-432mm / 17.36-17.01in
Unit weight
11.6kg / 25.5lb
Packed Dimensions & Weight
Single pack size W x D x H
500mm x 500mm x 255mm / 19.7in x 19.7in x 10in
Single pack weight
13kg / 28.6lb
Multi pack qty
24
Multi pack size W x D x H
1210mm x 1050mm x 1070mm / 47.6in x 41.3in x 42.1in
Multi pack weight
305kg / 670lb
Frequency Response and Impedance Curves
Topmost curve: Frequency response on axis | Secondary curve: Frequency response at 45° off axis
Power rating: 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.
Continuous power rating: Defined as 3dB greater than the AES rating.
Sensitivity: Measured on axis at 1W, 1m in 2π anechoic environment.
Parameters: Measured after unit subjected to pre-conditioning signal.
Xmax: 0.5*(Hvc-Hg) + 0.25*Hg
