Nonoise - no embarrassment on this one. Before my Missions, I've owned speakers from Allison, Dahlquist, Acoustic Research, Wharfdale and a bunch of others and I never knew I should care about this. It was just a bit of luck that I happened to read the Mission owner's manual this past week. But, my guess is that most owners never realize they should consider this. Just a word of caution: Mission said never to tighten the tweeters' screws and according to Stringreen above, Vandersteen doesn't want you to touch their bolts because of the mastic applied at the factory. (Thanks Stridgreen). So maybe we all should be checking with the manufacturer's before trying this. The article referenced by Rodman indicates it's a good tweak if ok with the manufacturers. Many thanks Rodman.