Also if your drawing is accurate,,,, first thing you will want to do is move the couch forward away from the back wall a couple feet at least (but don't place it in the middle of the room or bass will have nulls). Having it against the back wall can cause a considerable amount of boomyness.
-Funk 21.0LX Master/Slave combo 4800 watts RMS/9600watts (peak)-
-Chane A-2.4 L/C/R
-Chane A-1.4 side/rear surrounds.