I have a pair of LS-90's. Earlier today I was moving a component around in my system, and a feedback occured through my amplifier (I know, I should have turned it off). I quickly shut everything off, and then powered it back up. I noticed immediately that the speakers did not sound right - there was no high frequency sound coming from them. Putting my ear next to each tweeter, I have verified that neither tweeter is putting out any sound.
Is there any kind of protection circuit built into the crossover (like a fuse) that I can check, or are the tweeters blown? If so, are replacements available, and if so how much are they.