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In Reply to: Help needed: Tympani IVa midrange driver problem posted by mikebarney on April 7, 2021 at 12:50:52:
I'm afraid I will not be much help but looking at the schematic that you posted one score years ago, the mid-driver does not appear to be doubled. The mid impedance is marked at 5 ohms + the DCR of the coil. A better measurement is to remove the tweeter fuse so that the tweeter does not interfere. However, how this helps diagnose the problem is beyond me <(. I assume you already did the various cable and channel switches so you are convinced the problem is in the left channel speaker and not upstream. This is supported by the normal behavior of the tweeter and woofer.Addendum: Here's a thought. Pull the mid-fuse on the right panel and replace it with a 4 ohm resistor (the fuse is useless anyway). That will drop the output by ~ 5db : 20*log(5/9)=-5.1 db. Not a cure but a work-around. The remaining issue would be the balance of all three drivers.
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Topic - Help needed: Tympani IVa midrange driver problem - mikebarney 12:50:52 04/7/21 ( 33)
- Solved: Tympani IVa midrange driver problem - mikebarney 05:48:47 04/26/21 ( 2)
- RE: Well done! :-)) nt - andyr 19:57:43 04/30/21 ( 0)
- Congrats !!! - emailtim 18:17:24 04/30/21 ( 0)
RE: Progress report: Tympani IVa midrange driver problem - mikebarney 12:44:59 04/11/21 ( 2)
- RE: Good work! nt - andyr 14:11:40 04/13/21 ( 0)
RE: Progress report: Tympani IVa midrange driver problem - pictureguy 12:59:59 04/11/21 ( 0)
RE: Help needed: Tympani IVa midrange driver problem - Green Lantern 19:56:24 04/9/21 ( 1)
- RE: Help needed: Tympani IVa midrange driver problem - Roger Gustavsson 01:25:42 04/10/21 ( 0)
RE: Help needed: Tympani IVa midrange driver problem - mikebarney 09:08:01 04/8/21 ( 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 04/8/21 ( 9)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 14:06:04 04/8/21 ( 8)
- RE: Help needed: Tympani IVa midrange driver problem - Roger Gustavsson 00:32:47 04/9/21 ( 7)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 06:02:52 04/9/21 ( 6)
- RE: Help needed: Tympani IVa midrange driver problem - Roger Gustavsson 06:35:41 04/9/21 ( 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 05/1/21 ( 1)
- RE: steel ... - andyr 15:34:56 05/1/21 ( 0)
- RE: "cross bars at 2 or 3 locations to the rear of the panel" ... - mikebarney 05:56:28 04/11/21 ( 0)
RE: Help needed: Tympani IVa midrange driver problem - neolith 04/7/21 15:14:58 04/7/21 ( 3)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 17:05:06 04/7/21 ( 2)
- RE: "the bad channel exhibits a suck-out in the midrange relative to the woofer" ... - andyr 01:35:30 04/8/21 ( 1)
- RE: "the bad channel exhibits a suck-out in the midrange relative to the woofer" ... - Roger Gustavsson 08:41:27 04/8/21 ( 0)
RE: Help needed: Tympani IVa midrange driver problem - SteveJewels 14:32:23 04/7/21 ( 1)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 16:49:56 04/7/21 ( 0)
RE: Help needed: Tympani IVa midrange driver problem - andyr 14:32:11 04/7/21 ( 4)
- RE: Help needed: Tympani IVa midrange driver problem - mikebarney 16:48:37 04/7/21 ( 3)
- RE: "I've managed to avoid having to re-wire a panel this far" ... - andyr 17:50:11 04/7/21 ( 2)
- RE: "I've managed to avoid having to re-wire a panel this far" ... - mikebarney 19:36:43 04/7/21 ( 1)
- RE: Sadly, I suspect you are right, Mike. :-(( nt - andyr 23:05:59 04/7/21 ( 0)