All speakers£¬whichever kind they belong to,consist of two most basic components: speaker unit and the enclodure. In addition, the vast majority of the  speakers are equipped with at least two loudspeaker units to implement the so-called muti-channel audio playback points.And that¡¯s why the frequency driver is also one of the integral parts.Of course,there may be sound-absorbing cotton, inverted tube, the folded labyrinth channel, tie-bar,etc.But not any one of these components are essential for speakers, there are actually three most basic parts:the speaker unit, the enclosure and the frequency driver.