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In Reply to: RE: Quad 57 volume problem posted by lesleymorley@yahoo.com on January 17, 2016 at 10:13:27
I assume you switched amp channels to be sure it wasn't the amp(or preamp if thats seperate).
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Yes... definitely the speaker's problem, not anywhere else in the chain.
If you plan a DIY repair you need to isolate the problem. Used EHT units, crossovers, and bass panels are available from QUAD "disassemblers" in the UK via ebay. Of course new or rebuilt components are available from Germany or the US at higher cost.
If you have one good speaker to use as a donor you are in good shape to find the problem component and then replace it.
Are you sure that all three panels have reduced output? You might consider using a Radio Shack SPL meter or Harbor Freight DVM/SPL meter along with downloaded signal generator software to measure and compare the near-field output of all six panels.
never heard of doing a test like that before. Would it apply to ESL 63's as well? I can just see my OCD kicking in and I, and everyone else for that matter, may start checking the panels in their stats! Why? Well, because we can.Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Edits: 01/18/16
Some people are more sensitive to L-R channel imbalance than others... Some speaker companies match their speakers veneers, others match their frequency response, others--apparently--do no matching at all.
FYI: I have owned four pairs of QUADs over the years, the best pair were balanced to within 0.5dB between 100Hz and 4000Hz, the worst were off by 2dB. To my ears 2dB channel imbalance is noticeable. I have owned 9 pairs of Magneplanars and they have typically measured within 1 dB over the same narrow range.
The SPL meters I mentioned above are not laboratory grade nor are they wideband. They are cheap and available and can help you debug a broken speaker component or better understand your setup.
Thread the meter onto a camera tripod to make more repeatable measurements. Compare near field and far field results to gauge the impact that your room and placement have on frequency response.
I do have a Radio Shack SPL, camera tripod, and noise generator.
Cheers!
Ed
"I know just enough to get into trouble. But not enough to get out of it."
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