The noise you hear is dust. Take the cover off and carefully clean the speaker. If it doesn't work, it means that they ended their life.
Buy some good tweeters. The factory's one is a middle range and doesn't perform well at all...

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WEB Site : http://www.adamou.dpn.ch
A.S.C. 1999
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[This message has been edited by Adamou (edited 10-26-1999).]