Features: Bass radiator, also known as passive Speakers, is used to replace the inverted tube, the subwoofer with the radiator and the traditional back subwoofer. The low frequency depth is equivalent to the reverse type. The sense of speed is obviously faster than that of the reverse type, which have the advantage of a certain closed box. Completely eliminates the drawback of the inverted structure - that is, the noise brought by the inverted nozzle. Make great effect on enhancing the bass, convenient debugging. Increase the lower potential of the bass, the sound more excellent. Dramatically increase subwoofer efficiency and capability for ultra-low frequency reproduction at high decibel. Specifications: Component:Rubber+ABS Diameter: Approx.57mm/2.24inch Package Includes: 2Pcs Speakers Diaphragm note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.