Csontos --
Instead of pausing the playback try leaving your listening room without pausing playback for the same amount of time(though not to other noisy environments), and then return to see if it has the same effect on you. I play music from a harddrive(that is, RAM) -- no that this info may matter to the issue/subject at hand -- and I've repeatedly found that when playing longer sessions of music from my setup, with what I'd call "normal" listening levels, a momentary leaving the room gets my back to a slightly "invigorated" sound. A psychological effect, perhaps, or an indication maybe of my having listened too analytically for an extended period of time, which would then lead my ears/mind in the need of a brief "intermezzo" of absence/silence to "recuperate."
Unless you're playing at very loud volumes at the limit of your speakers capabilities I'd say heating up the voice coils to a more marginal temperature will only benefit the sound. My own speakers treasure being "shown the whip"(not in any way excessive) for an hour so, or even longer, after which they're more distinct, full, and clear sounding. This, mind you, has an effect even when my amp has been on for many hours(my DAC runs 24/7), and conversely when the SPL's have again been reduced to much lower background levels for an extended amount of time(hours), the character of the sound appears to have reverted into a more constricted "stasis."
