Variations in how your system sounds?


Apologies if this has been covered elsewhere.
My system sounds consistently good to my ears for the majority of listening sessions but every now and again (say 1 in 20) it sounds slightly 'off' -- not its usual self. It is a very small difference but i do hear it. I would describe it as a slight lack of focus and dynamics. This has happened through many changes of all components.
Is it my mood, or hearing variation? Do i need to filter my power? Do you have similar experiences?
mike60
'for me, alcohol consistently smears and thoroughly ruins the critical listening experience, even in small doses.'

I have found the opposite to be true in my case. A couple of shots of I.W. Harper, and my speakers sound like the Wilson Maxx.
Rok2id...from earlier in the thread: "I recently bought a Hi-Fi Choice magazine with a free System Set-Up disc." That's how. I'm here to help.

I have to warn the doctor that by "foreswearing alcohol" the girls will not get prettier at closing time, and telling 'em you're into B vitamins...well...that just never works.
An interesting subject and I'm sure it is a true observation. I am not convinced it is physiological, I'm a physician too. Some days, you turn the system on and it just is'nt firing on all cylinders and yes, I do give it time to warm up. I am not one of the leave it on all the time, believers.
I am not ware it is connected to how I feel, tiredness, anxiety levels. I have a pretty good power supply, with a Pure power regenerator. So I can not explain it, but I agree with Mike60's observation.
Stereo system is not a "robot", it is a "living thing" too. That's the explanation, very simple.
Emotion, ear wax, humidity, lack of humidity, lack of emotion and ear wax...if things were experienced in a state of static sameness we'd all go insane from boredom. We experience the differences between things like light/dark/loud/soft/feel good/feel bad and if it were up to "big pharma" it would all be one large bowl of bland soup. I play guitar much better on some days...I don't think it's the guitar's fault.