Barry_NJ,
At this time, I don't have a room diagram.

The room is roughly 21 x 12 x 8 with a drop ceiling.
A few distinguishing aspects of the room:
- The back left has a small kitty corner (so the room isn't totally symmetrical)
- The front left has a door to a good sized closet
- There are three good sized rectangular windows on the right wall
- The entry door into the room is on the left wall
I wound up mounting the (4) SVS Elevation speakers with a pair high up on the front and rear walls.
As of now, I have only run the speaker cable to the front pair (will get the rear pair wired this weekend).
So while I can hear an improvement, I am hoping it will be a good deal better once the rear pair is active AND once I run the Audyssey room correction software with the Atmos speakers in place (just did a manual setup for front pair).
Also, I still need to bring back into the room most of my GIK and Real Traps gear to help improve the sound.
George