Small speaker has difficulty making low tone. Because, principle that speaker phonate is that air is moved by cone's vibration. So the bigger cone became, the easier it sounds low tone. But, small speaker has small cone. So there is limitation to play low tone. In order to overcome this limitation to increase time that vibrate with making street of sounds likes maze. But, now it is hard to design this technology, so it is too expensive to ordinary customer buy. There is the speaker named M3 which is applied what is similar to this technology. It is 500,000won that this speaker's price is. In the future, the speaker which is applied this technology will appear at low price. So we have not to carry big speaker at stage and prepare large place to install audio/visual system. 스피커에 관한 내용인데 처음한거라서 뭔가 맞는것 같기도 하고 틀린것 같기도 하고 조언 부탁드려요