I too sound somewhat different after intense workout such as loadin' moving truck and then back to normal after muscle soreness eases up.
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I've been questioning my hearing after noticing something similar this week. After switching a different amp into my system I had to install a different ac cable ( the same Wireworld model, just a different length) and really bend the ends of my speaker cables into a new shape to feed them through my rack. I swore things sounded worse for about 8-10 hours before things smoothed out and sounded as I expected. This wasn't a new amp, it's one I have had for many years and am familiar with. Is the perception because of moving cables or because I needed to become acclimated to the change? I'm not going to speculate.
It could be that electricity 'learns' a path via the wire. When you change the path, the electricity learns the new path. The electrons that comprise electricity are considered matter even though they have no mass or volume but something about them qualifies them as matter by very bright people. So it may stand to reason that when observed, they behave as matter.
This matter travels a path in the most efficient way possible down the wire and when the wire (path) changes, it again learns the most efficient path. The only point of contention that I see is as infinitesimal it is to learn and navigate the new path and the speed in which it happens, is it enough to mess with the sound?
All the best,