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In Reply to: RE: ? on Quad 57 bass panels posted by Story on October 02, 2021 at 05:14:40
Wow sorry to hear about the flooding and damaged Quad!!
While the dust cover assemblies don't provide a hermetic seal they generally help with minor exposure to water, etc. I've certainly seen a number of ESL and ESL-63 that have dog piss all over the dust covers. Panels work fine.
The hum is a leakage path in the panel. Could just be dumb luck if the panels are original to the speaker they are quite old. Unfortunately once they start humming there is no fix short of replacement. They aren't even rebuildable at that point.
If the speaker is playing nicely other than the hum you can continue using it without fear of further damage. The damage has been done. Ultimately the panel will have to be replaced the hum will get worse over time.
I spent a good amount of time yesterday replacing the one bad panel. The replacement is Aok. A few hours playing music in the LR has proved successful and I'm going to put some new speaker cloth on it as I feel confident.
I've said before years ago how much better the speaker sounds with plain old speaker cloth covering the front instead of those grills which I took off years ago. Even the grills did not help the usual problem of dispersion. Of course, anyone who attempts such a task should have a safe environment away from poking fingers and curiosity. I'll post a pic or 2 later.
It would be nice if someone made new replacement panels someday for those who must have Quads and will not be satisfied with any other speaker. If this sounds like a hint then yes. Even rebuilding the retired because I'm still saving my bad ones.
Thanks and cheers to all
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