Speaker Placement on Wall

My room is a rectangular room, and my speakers are center on the smaller wall facing the long part of the room. I was wondering what kind of problems I might have if I don't have my speakers center on the wall. More towards one of the longer walls. Is there quite a bit of difference not having it centered on the wall. I am by far an expert but I can not tell much of a difference when it is not centered on the wall. Although I am listening on less than ideal monitors, and a non-treated room. Dave

Here's a good start at explaining this - http://www.etfacoustic.com/mirrortrick.html Gotta hit the sack for now, HTH... Steve