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Apart from the varying mood, it really must be the power line. For a nominal 220V, I've registered 201V to 233V, whith the higher voltage late at night.
Is it the atmosphere? The power line? Your brain? Does your system's sound quality vary from day to day?
Yes it is true. My system does perceive as to have a much larger sound stage and space between instruments/tracks seems to at least double at night. Especially during the darkest times of night. I believe it to be an auditory illusion due to the inability to see nearly as well. Your brain's auditory segment simply fills in the gaps that sight leaves unfilled in the dark. It just embellishes a bit by comparison. Also the air where I live seems cleaner at night.
I said it always sounds the same but I have two dedicated circuits, a PS Audio P300 on my front-end stuff and a PS Audio HC Ultimate Outlet on my amp. Doesn't matter when I listen it always sounds the same...as long as everything is warmed up.
Yes, though not every day. I believe it may have to do with one's brain and possibly the atmosphere, as I've often (not always) found others have the same impressions (that something seems different) as I have in the same listening sessions.
Great question! My system goes from sublime to cacophonous, sometimes day to day, but occasionally hour to hour. My girlfriend can tell how the stereo is sounding because my mood, pathetically, tracks my subjective response to the stereo. Terry Gross on 3/2/09 interviewed an author who's book discusses how our ability to analyze and make decisions is slaved to our state of mind, a book that, apparently, should be featured in installments in Stereophile's "As We See It." Both coming and going, my condition echoes these findings. Ignoring the bad days is key to battling upgrade-itis.
And sweet on high humidity days after a day or two of rain, rain, rain 'til humidity is 100%. Guess it could be the water vapor in the air slows down sound speed and enough to affect the sonic dynamic headroom? And also on the drivers—especially good light ribbons and planars? As after several dry days in our tropical island in the sun, speakers do sound brighter! And what of our ears too when saturated with water vapours as well? Please allow multiple choice selections. It's okay as anyone choosing conflicting ones will show. Then others can help with friendly and coherent explanations for one & all's knowledge and fun! Thank you for reading. Your further sharing on these is appreciated. Hi-fi just don't get it like at live concerts. Second convenient best at best!
Air's parameters (temperature, humidty) do influence to some extent sound quality as well as the power line (better at night!). Most important, taken for granted that the ears are well functioning as tranducers then, the brain, the mind and finally the soul are the very end users of a hi-fi system.
I think you didn't have the right choice for me; it does not always sound exactly the same, but none of the four offerings offered fit. In any case, I like the sounds I get, regardless. I know they could be better, but at a cost I cannot bear at the moment.