Slight buzz on Quad ESL-63..

My quads sort of rattled when you over drove them with highly percussive bass notes, and on high frequencies I got a low level buzz from piano notes in a narrow frequency band. Don't know if its the same cause of both problems, but a Quad garu told me to retension the dust cover. This can be a DIY project if you are ambitious and VERY careful. I'm sure someone can give you specific instructions. I'm not sure this is the cure, as I recall reading a review of the Quads a long time ago in which the reviewer referred to a tizziness - I didn't relate to what he was saying at the time.

Hi. Nice speakers. If this issue continues, it could indicate a panel problem. If you are in USA and need repairs, there are 2 companies that provide exceptional service. On the east coast, check out QS&D @ 540/372-3711. The other company is in California. If you need that info, let me know; I need to look up the contact info.