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Celestion's CF series is their latest, most technologically advanced range of high performance loudspeakers and is to be found in many top speaker brand high end designs.
The CF1840JD is typical of the series and offers the following featuresA lightweight, robust cast chassis designed to minimise reflection back to the cone to reduce acoustic distortion
Balanced airflow venting to maximise voice coil cooling to control thermal compression and increase power handling
FEA optimised magnet topology ensures even distribution of magnet flux in the air gap.
Double suspension systems with "flexiroll" surrounds ensure maximum control of the cone over large excursions.
A dual layer, inside/outside voice coil with glass fibre former provides massive power handling and efficient cooling.
General Specifications
| Nominal Diameter | 18 inch, 460 mm |
| Power rating | 1,200W AES, 2,400W continuous. 4,800W peak |
| Nominal Impedance | 8 Ohms |
| Sensitivity | 97 dB 1W 1M |
| Frequency Range | 30-2,500 Hz |
| Resonance Frequency | 37 Hz |
| Xmax | 12.5 mm |
| Qts | 0.397 |
| Vas | 155 l |
| Voice Coil Diameter | 4", 100 mm |
| Voice Coil Construction | Dual layer in/outside wound round copper |
| Former Material | Glass fibre |
| Cone Material | Kevlar loaded paper |
| Chassis Type | Cast Aluminium |
| Magnet | Ferrite, 112 Oz, 3.18 Kg |
| Total Weight | 25.5 lb, 11.6 Kg |
| Suggested enclosure | 150-180l ported at 40 Hz |