1.Bass radiator, passive , is used to replace the inverted tube, the subwoofer made with the radiator and the traditional back subwoofer, compared to the following advantages, low frequency dive depth and backward , But the of speed is significantly faster than the back-type. 2.possession of a certain tight box , but also completely put an outrageous structure of a drawback - that is, inverted pipe mouth to bring the wind noise. So like dive , but the speed has a demand for using the radiation made subwoofer is the best 3.The new and improved Bass radiator, allows you to mass the passive radiator to obtain the for ideal tuning frequency and additional without any additional amplifier power or enclosure .