You might want to consider room reflections. Are your side walls damped - at least where you have the first reflection of sound. What is on your back wall - I suggest damping it also. Do you have carpeting - If you are getting reflections off the floor and ceilings - not good. All these things, as well as, speaker placement affect imaging and depth. Too much damping and you may lose a little on the higher frequencies. If that is a problem, try using something that will diffuse the sound versus damp it. Good luck and enjoy!