I've always found when I sit down and listen, not expecting to be impressed by my system, is when I am impressed the most. If I go in expecting to be blown away, I am disappointed. As others have indicated, our brains can do funny things, based on our mood or what we expect. Sure, they certainly may be other factors at play, but if I were a betting man, I'd wager that the majority of the differences you hear are related to your own body/mind. That is, unless your mains voltage swings wildly from day to day.
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