I can remember discussing this topic with some audio friends back in the late '80s. It is certainly not new or an uncommon phenomena. Some of the things we listed as possible causes at the time were: air temperature, humidity, frame of mind, and quality of power coming in. (One buddy had a 1 Farad, that's right 1 Farad capacitor in his basement to filter incoming power. ) We also suspected that sometimes maybe capacitors in the amp/preamp take a set a different way once in a while and can make the music seem dull. (We had mostly tube gear).
I have a pretty constant turn on and warm-up routine for my equipment. It sits minimum 1 hour before I play anything. I will wait several hours if the equipment has been off for several weeks.
I have a pretty constant turn on and warm-up routine for my equipment. It sits minimum 1 hour before I play anything. I will wait several hours if the equipment has been off for several weeks.