Just got a pair of JBL L110 speakers which sound very nice but I noticed a strange problem with the tweeters. One seems to have a different character than the other. One sounds very bright and the other more muted. Adjusting the controls full up revealed that one has much more output and is harsher than the other. In order to eliminate a crossover problem I swapped them and it followed the tweeter. So I found another 033 and replaced the deader sounding one. Much closer but they are still not a perfect match. Is this common on these tweeters? Got another one coming and hopefully between the 4 I can put together 2 that match. Any suggestions, is this common due to the age of the units or was there really that much production variance ?? Anyone that can help clarify ?? Am I missing something ?