Celestion CF1840JD 1200 Watts RMS / 2400 Watts 18-inch PA Woofer 8 ohm Subwoofer Dual Demodulation Rings
Product Highlights 18" ferrite magnet, cast aluminium chassis LF driver delivering 1200W rms (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 Balanced airflow venting provides enhanced cooling 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 Optimized double suspension and "multi-roll" surround provide exceptional linearity at extremes of cone excursion Product Specifications Nominal diameter: 457mm / 18inPower rating: 1200WContinuous power rating: 2400WRated impedance: 8OSensitivity: 97dBFrequency range: 30-2500HzChassis type: Cast aluminumMagnet type: FerriteMagnet weight: 3.18kg / 112ozVoice coil diameter: 100mm / 4inVoice coil material: Round copperFormer material: Glass fibreCone material: Kevlar loaded paperSurround material: Cloth-sealedSuspension: DoubleGap height (Hg): 10mm / 0.39inVC winding height (Hvc): 30mm / 1.18inAdditional impedances: 4O Parameters Sd: 1134.12cm2 / 175.79in2Fs: 37.00HzMms: 217.40g / 7.67ozQms: 4.372Qes: 0.437Qts: 0.397Re: 5.29OVas: 155l / 5.47ft3BI: 24.76TmCms: 0.09mm/NRms: 11.56kg/sLe (at 1kHz): 1.16mHXmax: 12.5mm / 0.49in Packed Dimensions & Weight Single pack size W x D x H: 500mm x 500mm x 255mm / 19.7in x 19.7in x 10inSingle pack weight: 13kg / 28.6lbMulti pack qty: 24Multi pack size W x D x H: 1210mm x 1050mm x 1070mm / 47.6in x 41.3in x 42.1inMulti pack weight: 305kg / 670lb Mounting Information Overall diameter: 460mm / 18.11inOverall depth: 220mm / 8.7inCut-out diameter: 414mm / 16.24inMounting hole dimensions: 11x7mm / 0.43x0.28inNumber of mounting holes: 8Mounting hole PCD: 441-432mm / 17.36-17.01inUnit weight: 11.6kg / 25.5lb