In Reply to: Help needed: Tympani IVa midrange driver problem posted by mikebarney on April 7, 2021 at 12:50:52:
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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Follow Ups
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 09:08:01 04/08/21 (13)
- RE: Shirley the pole piece *needs* to be bowed ... - andyr 04:53:32 04/10/21 (2)
- RE: Shirley the pole piece *needs* to be bowed ... - mikebarney 05:33:52 04/10/21 (1)
- RE: Shirley the pole piece *needs* to be bowed ... - Roger Gustavsson 07:41:18 04/10/21 (0)
- RE: Help needed: Tympani IVa midrange driver problem - Roger Gustavsson 13:09:54 04/08/21 (9)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 14:06:04 04/08/21 (8)
- RE: Help needed: Tympani IVa midrange driver problem - Roger Gustavsson 00:32:47 04/09/21 (7)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 06:02:52 04/09/21 (6)
- RE: Help needed: Tympani IVa midrange driver problem - Roger Gustavsson 06:35:41 04/09/21 (5)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 05:30:51 04/10/21 (4)
- RE: "cross bars at 2 or 3 locations to the rear of the panel" ... - andyr 15:37:10 04/10/21 (3)
- RE: "cross bars at 2 or 3 locations to the rear of the panel" ... - Roger Gustavsson 08:11:19 05/01/21 (1)
- RE: steel ... - andyr 15:34:56 05/01/21 (0)
- RE: "cross bars at 2 or 3 locations to the rear of the panel" ... - mikebarney 05:56:28 04/11/21 (0)