Raspy buzz on certain low frequencies

Planar Speaker Asylum

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I've got a custom pair of planar speakers, made from the old Alternate Audio kit. 4' Mylar diaphragm, copper wire, very strong magnets.
One of the speakers has problems with certain low frequencies - most notably timpani in the area of about the octave below middle C.
I would like to try and repair this, but it is a gargantuan task to take the magnets apart, which hold the Mylar in place - a job I don't feel capable of handling.
The repair DIY guide in the link seems like a doable job. But I am a bit reticent to do it, in fear of further damaging these overall lovely (and irreplaceable) speakers.
Has anyone tried a repair like this? Advice and warnings sought!
http://integracoustics.com/MUG/MUG/tweaks/DavePride/

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Schiit Audio

Topic - Raspy buzz on certain low frequencies - Dr. Fuse 16:28:49 05/9/21 (7)

RE: Raspy buzz on certain low frequencies - Dr. Fuse 14:26:31 05/21/21 (0)

RE: Raspy buzz on certain low frequencies - George S. Roland 18:33:15 05/14/21 (1)

RE: Raspy buzz on certain low frequencies - Dr. Fuse 18:47:28 05/14/21 (0)

RE: Raspy buzz on certain low frequencies - Green Lantern 18:38:11 05/11/21 (3)

RE: Raspy buzz on certain low frequencies - Dr. Fuse 18:48:31 05/14/21 (0)

I would add - Green Lantern 18:58:26 05/11/21 (1)

RE: I would add - Dr. Fuse 18:49:15 05/14/21 (0)

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