Just the other day, I was listening to ELP in the living room at, shall we say, 'elevated' volume. Well, I forgot to check that the "B" speakers in the kitchen were switched off. They are in-ceiling, infinite baffle, i.e. I haven't constructed backer boxes for them yet. Of course, that arrangement makes them kinda vulnerable to overpowering.
Just yesterday, I noticed a slight, intermittant crackle coming from the mid/woofer in one of those speakers. It isn't loud, or constant and it doesn't seem to happen at any particular frequency. I removed it from the baffle and didn't see any visible damage. I am concerned that I did damage it though. I don't know what else would cause that strange crackling noise. It only comes from that one speaker, so it can't be a problem "upstream". Any suggestions?