Thiel Owners

" Cascadesphil - my working hypothesis is that dry air and moist air couple and resolve the various forces differently - not a theory, but a hunch developed over the past year of experimentation."

Tom - thanks.  I sort of figured it could be something like that.  After one session, where I had some issues, I actually grabbed my allen wrench to make sure the drivers were tight and they were.  For a bit it drove me a little crazy (and some would say that's not a far drive) and I went back to the video on how the 3.7s were made and was thinking about looking inside.  Then when I played the same stuff where I didn't notice a problem.

Back in early March of 2020, I had my AC units tuned up (as I usually do annually and I have two zones, one for a large bonus room upstairs and I go upstairs about once or so a week to move dust around and flush the toilet).  Bacteria gets attached to the area around the coils and they get cleaned with either wipes or Lysol.  I decided to put in the Patriot UV light (https://www.patriotiaq.com/#!/Patriot_UV) on the main zone (and my bedroom and the living area I use is on the main zone) at the time of the tune up.

Since then, I began to notice (don't know if it is coincidence) a couple of things.  I've been sleeping a drop better.  Also, I began to notice (at least a bit more) those anomalies with the 3.7s.  I probably noticed them before that but to me it seemed less that I chalked it up to perhaps my ears were dirty (I go to the ENT on average about every 10 months as my ear canals build up wax) at the time.

So put a felt cloth on the flat space above the tweeter on the 3.6’s?

Try it. Send a PM for more detail.
TT

Tom - I have to admit I'm, um, baffled by your laminar launch baffle treatment suggestion. How would that be done with the 3.7?

As I mentioned, I don't have 3.7s. If I were testing them, I would find some music and/or test signal that reliably produce the problem. I would use a stethoscope to reliably hear it. I would then mount felt and test, then add UltraSuede and test. Etc. The process is slow and deliberate. There is room for other input such as internal wire rattling, etc. I saw a video that showed the driver wires fed through silicone tubing. Perhaps that's a culprit. It is interesting that more than one person has heard something similar. I don't know the answer, but I do register your experience.