I have an uneven front wall with my Magnepan 3.7i's. The left speaker is 9' away from the wall and the right speaker is 7'. I don't think there's a noticeable difference, but it could be because they're far enough away from the front wall already. I was surprised that I could tell the difference in sound quality when the speakers were 7' and 5' away versus 9' and 7' though.
Dipole Asymmetry
I am considering purchase of a pair of Martin Logan Summit X speakers. In my room, I am somewhat constrained for speaker placement. I could place the speakers about 3-4 feet off the front wall. My main concern is my audio rack would be placed directly behind the left speaker, while there would be nothing placed behind the right speaker. How detrimental would this asymmetry be on sound quality?