I would say that you need to start about a foot from the back walls and at least a few form the side walls. It really at that point comes into trial and error in finding your personal sweet spot for these speakers. Stand mount speakers need some room behind them in some cases to see their full glory I would say start at a benchmark and go from there until the sound is want you are requiring form your system. There is no scientific equation for this because every speaker is different and every one will like certain distances that others would not. You have some good speakers I would say play with them and see what they can give you. Remember your room has a lot to do with how they will sound and any perceived notions about where to put them might be out the window when it comes to your particular room. Its not a bad thing you just need to find a spot where these jems feel good to you and your living space.