Is there any rule of thumb for speaker placement in regards to distance apart, and distance from side and rear walls? My current setup is in a corner with the listening area about 9 feet away, speaker are 6 1/2 feet apart, with the left front about 8 inches from the wall. Both speakers have about 12 inces room in the rear.
If I move the speakers to 5ft apart, it will give me more side as well as rear clearance. I guess my question boils down to is 5 feet seperation to close?

A computer once beat me at chess, but it was no match for me at kick boxing.