Your images are not all that helpful Steve... Take a look at this Aerius re build and perhaps PM the author if he's still around
https://www.martinloganowners.com/threads/my-rebuild-of-some-aerius-i-speakers.15267/
With respect....You are talking out of your Derrière.
You are aware ? of the many threads/posts from ML owners who have restored the performance of their dull sounding speakers akin to near new after washing the film of gunk that has accumulated over the years off of the Mylar panels.
Covering...
The diaphragm is constructed from very thin low mass PET ( polyethylene terathylate ) and like any such material can be damaged by direct heat, hopefully yours are just settling in again after their bath, good luck.
On reflection regarding your sequel II’s the rather nasty sounding combination of cooking oil and smoke molecules may prove beyond a basic wash with tap and distilled water alone.
Should the ‘Gunk” on the panels appear resistant to the above you may have to consider a slightly more radical...
Hi Paul.
do you have your GAIA’s screwed up tight against the underside of your ARTs so the top of the feet are hard against the speakers? Or do you have the odd turn unscrewed in order to orientate the logo to the front.
@brd78...nice to hear your thoughts, I will endeavour to orientate the GAIA’s for optimal however I wonder whether
“The isolators are directional and are designed to be aligned with the speaker’s motive forces."
might indicate that given the mechanics with which ESL panels physically operate...