@ott "and the walls are being soundproofed. The room is 18' X 15' and will be fully carpeted. ....There are French doors that will be covered with moire curtains."
You are lucky to have what sounds like a dedicated room. I have one too. Be careful not to overdamp; you don't want to be listening in a near anechoic chamber. To create a realistic soundstage you do need some reverberation. You speak of 'soundproofing' the walls. Assuming this is not to prevent the sound entering the rest of your home (in which case 'soundproof' the other side of the wall), if you are damping all four walls, do it lightly with thin material. In my room I damped the wall behind the speakers with heavier material and kept the other three walls cloth thin. Like you I carpeted the floor, but the ceiling is plaster.