12-12-11: NeedfreestuffThanks for the response. Not sure how relevant it may be, but as a point of information I'll mention that I've consistently noticed that if my Stax electrostatic headphones are not used for a period of a few weeks, they sound very thin when I resume using them. A good workout at high volume for an hour or two will bring back the missing richness.
I have electrostatic speakers so it rules out the drivers loosening up.
In any event, my basic point was that with audio equipment there are a lot of subtle variables that can be involved, many of which are easy to overlook or be unaware of. And when sonic effects are perceived that seem to defy technical and common sense plausibility, my expectation is that in many cases (though undoubtedly not all cases) the effect is being attributed to the wrong variable.
Best regards,
-- Al