How often is your system "good"?

No doubt the quality of the power we receive from the local utility company varies.  I do not find that the quality of my sound varies anymore.  For me, the magic bullet is the power regenerator that all of my components receive juice from save my power amplifier which receives filtered power.  I know the regenerator/conditioner issue is a controversial one.  I only relate my experience including right now as my sound is great.  Prior to the regenerator, I experienced what many other audiophiles relate...that their sound is best late at night.  The implication being that fewer devices are in use on the utility line and hence there is less distortion feeding the system.

As long as things stay as they are here, I won't change a thing.  If performance changes at some point, then I'll need to adapt and work to find a solution.  Life is too short for compromised sound due to the quality of the electricity we feed our systems.

I work outside and when the weather and pressure changes so does my hearing acuity.  I wear earplugs often and that affects my high freq perception by making things seem bright.  

Power supply is definitely my biggest factor.   Turning off ceiling fans and other power suckers in the house makes for the best listening experience.

My system in always good. Sometimes I'm not. If I have a cold, the system doesn't sound so good. When I had a kidney stone it sounded terrible. When I was recovering fro open heart surgery, and I was on pain meds, it sounded great. My point is I've come to appreciate I am the greatest variable in how my system sounds

System sounds great when the wife is out. 

Simply put I can crank it to realistic concert levels or the sound of real instruments and that to me is where a high end system shines most - loud, dynamic and yet absolutely crystal clear effortless sound.