Listening distance

My speakers are at 8.5' apart (center of woofer) and my ears are at 10.5'-11' from speaker center line. Not an equilateral triangle but to each there own I say. Only your ears and source material matter! Enjoy!

6 foot triangle. I use a single driver with a tweeter. The imaging is very good.
There Are many factors that dictate the distance of listening. The room is the biggest factor to consider.
Speaker hight and how many drivers is another.

I move my listening position back and forth depending on many things. I believe that fixed position is always a more or less acceptable compromise; it doesn't appear to be the best approach.

Inna, I don't understand what you mean by a fixed position is an exceptable compromise.
But moving around is not a compromise ?
Once you get your speakers positioned in the best possible place in the room, then get your seating in the best possible position in the room, how can that be a compromise ?
We all know that everything in this hobby has some form of compromise. But floating around your listening position is not going to give you stability.
Just my opinion of course.

Since stereo reproduction is a psychoacoustical phenomenon, I tend to move forward and back by around a foot while listening depending on the recording. My thought is that the perceived soundstage for any given recording is dictated by the person who was originally twiddling the knobs, and that individual's setup (distance from monitors, toe-in angle, nature of control room acoustic, their hearing and personal taste) all have an effect as to how and where the soundstage unfolds upon reproduction.

For a point of reference however, I tend to use a mono recording to 'set' where the listening distance ought to be for my room and system, other times I'll use pink noise.

Either way, a good system (and room) should be able to present a satisfying presentation without necessitating the proverbial "head in a vice". Just a thought.