The level at which you listen to music will be a factor in how far you need the Sols from the rear wall.If not at ear bleeding levels the Sols do fine 24 inches from the rear wall and maybe less depending on your listening habits.I have 6.3s 24 inches off the rear wall and 11 ft apart..I'am not having any bass or imaging problems.Any speaker you get.. you will have to play with it until it sounds right to your ears.
Good Luck!
Good Luck!