Physical explanation of amp's break in?


Recently purchased Moon i-5, manual mention 6-week break in period, when bass will first get weaker, and after 2-3 weeks start to normalize. Just curious, is there ANY component in the amp's circuitry that known to cause such a behaviour?

I can't fully accept psycho-acoustical explanation for break-in: many people have more then one system, so while one of them is in a "break-in" process, the second doesn't change, and can serve as a reference. Thus, one's perception cannot adapt (i.e. change!) to the new system while remain unchanged to the old one. In other words, if your psycho-acoustical model adapts to the breaking-in new component in the system A, you should notice some change in sound of your reference system B. If 'B' still sounds the same, 'A' indeed changed...
dmitrydr
Does it keep on breaking-in until it breaks down or does it stop exactly at the zenith of this process? Do you hold to the theory that the component unlearns this molecular path of least resistance trick if not used and has to go back to "conductivity class". Does a component reach a point where it should be tossed out because this prime molecular path is too worn to be of any use? As the other fellow on the other site puts it "inquiring minds want to know". Thanks.
Pbb: you bring up valid questions that i addressed above. We were probably typing at the same time and our posts "crossed in the mail". Sean
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Thanks Sean. Indeed, first time I see so professional and practical *positive* opinion on that matter. I would highly appreciate your opinion about cables break-in: cables are generally simpler 'devices', which offers less room for 'combining'...

I think both emotional and psycho-acoustical components take their part here as well, but as I mentioned in the original post, there are some aspects that cannot be explained just by "delusive perception".
It takes a little while for the electrons that have been randomly thrown into the amp to get together and sing Kumbaya.

It also takes them a bit to see the arrows on the shielding of the cables. A confused electron is a terrible thing.
Sean - Excellent response! From those of us who are ee and still use our test equipment, brains, and ears, thank you. Keep preach'n, even if only to the choir.
As always, just one man's opinion.