USP, welcome. As you've probably gathered by now, what was heard at the store is about 180 degrees away from almost all other reports on the M80s, including those who preferred other speakers. Since personal preference seemingly couldn't explain such a difference, I'll again mention something that's happened here twice in the past: were the mids and tweeters on the M80s accidentally(or otherwise)disconnected because the connecting straps on the terminals were loosened?

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Enjoy the music, not the equipment.