I doubt it is silver…
Anybody want to weigh in on @holmz ’s theory that it’s IMD?????
My theory is that if it is IMD, you are going to need an O-scope, and not just handfuls of cables to try willy-nilly. That is just an exercise in futility, unless you have some reason to suspect that a super high capacitance is causing an oscillation. We would not know that without knowing the amp, speakers, and speaker cables.
But we do know that an silver cable (etc.) before the preamp and headphones, are the cables that you are looking for.
So entering into “cable-boccacci” is throwing solutions at a problem, that we do not know can be fixed with a cable. Why not pyramids, fuses, cable lifters, etc. as well?
If it was hearing, then it is possible that it could be the muscle that pulls the drum tighter to make loud sounds less loud.
It is possible to have that autonomic system become non-operational with extended ‘super concentrated’ listening. It is not overly common, and if the mrs is hearing it from the kitchen, then we can 99% discount that as a reason… Just not 100% discount it.