i think temperature and humiditity may contribute, and also how "sequenced" the ears are before a session. Similar to when a singer or a insturment player goes through all of the notes high to low before going on with the arrangement. Better to go through all of the listening frequencies before playing on.
Do the Audio gods shine upon you?
Has anyone else had this experience or am I just nuts? You sit down for a quiet evening of Hi Fi listening and after some warmup time you suddenly realize that your system sounds dramatically better than it did the night before. I am talking about those little things like more resolution, low level detail. You know, those things that turn audiophiles on. I am almost afraid to turn my system on again for fear that the "audio gods" have abandoned me.