The way i see it there are two different types of speaker. A sealed one, and a non-sealed. I thought the sealed speakers were infinite baffle. This means if you have two speakers in a box, when ou push one in, the other will come out etc... These spekers produce a bewtter sound, but need a lot more power to drive them. Can't remember why there better, will find out and let you know. I would imagine it would improve responsiveness, ie with a normal speaker, the speker wuold push out, but theres not much to force it back in. With infinite baffle, it would be forced back in by the vaccum, which should make a "crisper" sound