One more thing to check, because I had this problem with my KLF-20's, is the screws holding the magnet onto the horn. For me, it was midrange buzzing. When I took the speaker out, I noticed that a couple of the screws had worked loose. Tightened them down and volia, the buzz went away. Haven't heard it since. (2 years ago)
Matt
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"The Legends Continue!"