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? on Quad 57 bass panels

Posted on October 2, 2021 at 05:14:40

Posts: 4980
Location: NJ
Joined: December 11, 2000
and hopefully someone can offer any knowledge, guidance.

Here's the short - NJ had big storm IDA and all hell broke loose when my basement started to flood. I was going crazy rescuing as much as I could but one of the 57's fell face first into a bit of water. I still cring. I had unplugged the whole system 8 hours earlier but I can still remember the sizzle sound. It was only a short amount of time wet, not submerged, but charging them up again in the living room weeks later I'm hearing a hum from just one panel in one speaker.

No signs of any water or anything else, it certainly looks ok but the one panel makes a very soft hum. No other connections just the wall charge. Other speaker ok, other panel ok. I hooked up a temp amp and all sounds ok for now with 2 speakers setup on Living room floor and mono image in the middle, but the hum must be caused by????

Any suggestions? I do have 2 spare panels and may have to replace it but thought I would ask first. I haven't taken a volt reading and it's not the easiest thing to do with regular VOM's. The last time I measured the panels I used about 6- 1meg resistors in series to allow some kind of un-calibrated reading to compare one speaker to another. I have the latest pwr supply rectifiers from --- I forget the name, Piquet? in U.S.

I'd like to rectify this before the basement is restored in a few weeks as I'm still awaiting the new carpeting. They've been in my family for almost 70 years so I need some help!


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RE: ? on Quad 57 bass panels, posted on October 2, 2021 at 07:24:37

Posts: 4498
Joined: March 26, 2001
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.

Good luck!


success for now, posted on October 3, 2021 at 11:45:06

Posts: 4980
Location: NJ
Joined: December 11, 2000
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


RE: success for now, posted on October 3, 2021 at 19:39:04

Posts: 835
Location: Signal Mountain, TN
Joined: January 14, 2006
Glad to hear you are up and running again. I cringed when I read your post.
Now Im going to make sure my sump pump battery back up is in good shape.


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