
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 excursiongeneral specificationsnominal diameter: 457mm/18inpower rating(1): 1200wrmsnominal impedance: 8ohmsensitivity(2): 98dbfrequency range: 30-2500hzvoice coil diameter: 100mm/4inchassis type: cast aluminiummagnet type: ferritemagnet weight: 3.18kg/112ozcoil material: round copperformer material: glass fibrecone material: kevlar loaded papersurround material: cloth-sealedsuspension: doublegap depth: 10mm/0.39invoice coil winding width: 30mm/1.18inxmax(3): 10mm/0.39insmall signal parametersd: 0.38m/14.96infs: 44.2hzmms: 215.15g/7.59ozqms: 4.21qes: 0.496mmd: 185.145g/6.54ozqts: 0.444re: 5.29ohmvas: 113.924bi: 24.758tmcms: 0.063mmrms: 13.653kg/sle (at 1khz): 0.96mhmounting informationoverall diameter: 460mm/18.11inoverall depth: 220.35mm/8.68incut-out diameter: 414mm/16.3inmounting slot dimensions: 11mm x 7mm/0.43-0.28innumber of mounting slots: 8mounting pcd range: 441-432mm/17.36-17.01inunit 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.
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