I know nothing about room treatments. I am setting up a new system in a new room. The room is approximately 16 x20 with the 20' length being only 16' in one corner where there is an indent.

My first choice for speaker location is along the 16' wall facing into the 20' length. However, that wall has a 6' x 6' window (2' off the ground) that would be located between the two speakers.

Does a window behind the speakers have any significant effect on the sound? Would curtains help any?

M60's Rotel Nad Music Hall MMF-5
M80's VP150 QS8's Sherwood Newcastle Panasonic Plasma
Algonquins