I bought a set of infinity reference 6.5 components off ebay. One of the tweeters came broken and the other worked. I returned the broken one to a certain store for a new one. Now the one that worked(not the new one) is broken too. Do tweeters have a tendency to go out when they get older? I only had a 37.5rms jbl amp pushing the whole component set. They are supposed to be 90 watts rms. Would having it mounted real close to a metal surface with nothing behind it maybe have messed up the magnet or something or where they just old and messed up when I got them?