Background details is a parameter that helps me to find improvements or losses obtained with changes. I'm not implying that it's the key thing but I have a couple of tracks that have details that pan between LR and if presence is better it's a good sign to check other qualities in the presentation. Take for certain that a change that you make (after the needed set-in time)gives something you don't like ( less presence or coloration in voices) might require other adjustments to judge properly.
I particularly select a track on a CD (a segment of it) and use the repeat feature to check between settings trying to detect main differences to keep into account in longer listening evaluation sessions. Also is a good thing to go back to your previous setting for lengthy listening and compare notes and your emotional reactions to the music.
As Elizabeth noted it's a complex skill that has to be developed, good thread
I particularly select a track on a CD (a segment of it) and use the repeat feature to check between settings trying to detect main differences to keep into account in longer listening evaluation sessions. Also is a good thing to go back to your previous setting for lengthy listening and compare notes and your emotional reactions to the music.
As Elizabeth noted it's a complex skill that has to be developed, good thread