ParameterModel No :15X400General SpecificationsNominal diameter 380 mm/15 inPower rating? 800W(AES)Nominal impedance? 8OHMSensitivity? 97 d BFrequency range 45-1500 HzChassis type? cast aluminumMagnet type? FerriteMagnet weight? 100 ozVoice coil diameter? 99.2 mm/4 inCoil material? copperFormer material? Glass fiberCone material? PaperSurround material? ClothSuspension? Double?Kind of layers? outside/insideNumber of layers 2Gap depth? 14.0 mm/0.55 inVoice coil winding width? 23 mm/0.9inNet weight? 12.5 kgShipping weight 13.5 kgFeatures?4-inch,fibreglass inside-outside copper voice coil1600 Watt continuous program power handling97 dB Sensitivity45-1500 Hz Frequency rangeFerrite magnetDouble spider suspensionDie cast Aluminum ChassisThis is the professional speaker . It can be widely used in the stage. http://www.chinasoundspeaker.co...e-pro-audio-speaker.html