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In Reply to: RE: Help needed: Tympani IVa midrange driver problem posted by mikebarney on April 07, 2021 at 12:50:52
That's a sad tale, Mike. :-(( Not only because it has left Magnepan in that state, after a re-wire - but also on account of the lack of response you have gotten from their people.
I had a similar problem of a mid driver on one side outputting less than the other one about 20 years ago, when I re-wired one of my mid panels (due to a slip with a screwdriver when I was screwing my IIIa panels into the new hardwood frames that I had a furniture maker construct). :-((
After glueing the new mid-range wire down, I found it had less output than the other one - which destroyed the central image.
I put this down to the fact that I had put too much glue on the mylar, when I was doing the re-wire and the extra mass of that mid reduced its output.
So I suggest you should have a close look at both mids and see whether the left one looks like it has more glue than the other.
If so ... re-doing the wiring is the only solution.
Good luck!
Andy
Follow Ups:
Andy-
Thanks for your note. Your suggestion is, unfortunately, exactly what I fear the problem may be - some error in re-furbishing the midrange at the factory. My next step is to dis-robe the good panel (another hundred or so staples!) and compare the two mids visually. Electrically they seem identical.
I've owned a number of Maggies over the years, and although I do a lot of DIY audio, I've managed to avoid having to re-wire a panel this far. Maybe my luck has run out!
Mike
It's not something I would ever attempt again, Mike! :-((
It's a shame that it was done by the factory .. but I suggest getting them to re-do it will be your best option.
Andy
PS: if you get this done ... maybe consider asking them to use QR foil rather than round-wire?
Andy-
I'll ask, but I've heard they'll only use the foil on speakers originally designed using it.
Thanks,
Mike
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