listen to the first 30 second of michael jackson's "man in the mirror" on a brand new out of the box pair of speakers. Pay attention to the synth chimes at the start. Then listen again after 20 then 40+ hours "break in" time.

New tweeters will almost always break up a bit with this torture test, and it's easy to hear them struggle new out of the box with this one. smile

Tweeters in general will definitely settle down and mellow out. Woofers I'm not so sure.