Celestion : T5828: 18″ 500W Speaker 8OHM

18″ ferrite magnet cast aluminium chassis LF driver delivering 700Wrms (AES Standard) power handling and 94dB sensitivity3″ high temperature multi- layer voice coil for greater motor forceFEA optimized magnet assembly delivers highly symmetrical cone – movement leading to exceptionally low harmonic distortionBalanced Airflow Venting (BAV) on the front-plate increases airflow to provide enhanced coolingDual Magnet Motor (DMM) incorporates a secondary magnet used to increase overal motor force (Bl) without the need for any additional increase in magnet size”Multi-roll” surround provides exceptional linearity at extremes of cone excursionNominal diameter 18in/457mmPower rating 700WrmsNominal impedance 8?Sensitivity 94dBFrequency range 30-2500HzVoice coil diameter 3in/75mmChassis type Cast AluminiumMagnet type FerriteCoil material Round CopperFormer material Glass FibreCone material Glass-Reinforced PaperSurround material Cloth-sealedSuspension SingleXmax 5mm/0.79inGap depth 8mm/0.31inVoice coil winding width 18mm/0.71in