Call me crazy, but I noticed a significant increase in brightness today when I plugged my Modi 2U directly into the wall rather than plugging it in a generic extension cord. I remember yesterday I wasn't very impressed with the overall tone and was looking to upgrade to a sabre based DAC, only difference today was to plug it in the wall directly. Now it has gained some grainess or air that I wanted instead of sounding too natural. Maybe I was too tired yesterday or something happened, I don't know. Anyone else have any similar experience?
My setup sounds different to me everyday.
Atmospheric pressure, mood, blood pressure, etc will affect your hearing way more than barely measurable differences made by plugging your amp straight to the wall