I guess you could use some kind of formula as a starting point but my advice is to put them where they sound good to you.After all,you are the one that is listening to them not some geek in a lab.Just a thought.
+1 on both preceding comments and consider as well that angle (toe in or out) can be non standard as well. I have found that my room requires on speaker be more than 5 degrees different from the other to center the sound image.
I would have to agree.Starting of with the equal distance idea is a good place to start.If you have 10'between speakers ,then use 10' of distance to you.This is just to start out with, although a lot of people use this in their final setup.
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