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RE: Help needed: Tympani IVa midrange driver problem




New data point: I removed the ribbon and the grille to inspect the mid panel. I found that the perforated metal backer panel of the midrange, to which the magnets are mounted, is bowed away from the mylar, over 1/4" in the center. That extra distance from the magnets to the mylar and voice coil is likely the cause of loss in efficiency.
I'll see if I can design some braces to hold that perforated panel closer to flat.
Photo attached.
Mike.

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