spitty sound coming from right speaker.

My right tweeter makes a spitty sound when I play fast, dynamic(strings, female vocals) music at normal levels. What can it be? I checked the speaker connections. This comes and goes but seems to be getting worse recently.
Any ideas?
Sounds like a blown tweeter. Connect the left speaker cable over to the right speaker. If it is still distorted it is the speaker.
Yeah I was playing James BRown live at the Apollo pt 2(delux edition, awesome cd) at moderate volume, and when he shouted it got all distorted. It makes me very sad. Now I have to look for new speakers.