2Pcs Rubber Bass Radiator Passive Plate Woofer Vibration Membrane 30MM 40MM 50MM _x000D_ _x000D_ Product Name:Woofer Vibration Membrane _x000D_ _x000D_ Type:30MM,40MM,50MM _x000D_ _x000D_ Color:Black _x000D_ _x000D_ Material:rubber _x000D_ _x000D_ Description: _x000D_ _x000D_ 1.Bass radiator, also known as passive speaker, 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 sense of speed is significantly faster than the back-type, _x000D_ _x000D_ 2.possession of a certain tight box advantage, but also completely put an outrageous structure of a drawback - that is, inverted pipe mouth to bring the wind noise. So like dive deep, but the bass speed has a higher demand for friends using the pot made subwoofer is the best choice _x000D_ _x000D_ Package Include: _x000D_ _x000D_ 2 Pcs Woofer Vibration Membrane 2Pcs Rubber Bass Radiator Passive Plate Woofer Vibration Membrane 30MM 40MM 50MMProduct Name:Woofer Vibration MembraneType:30MM,40MM,50MMColor:BlackMaterial:rubberDescription:1.Bass radiator, also known as passive speaker, 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 sense of speed is significantly faster than the back-type,2.possession of a certain tight box advantage, but also completely put an outrageous structure of a drawback - that is, inverted pipe mouth to bring the wind noise. So like dive deep, but the bass speed has a higher demand for friends using the pot made subwoofer is the best choicePackage Include:2 Pcs Woofer Vibration Membrane