John,

There is 4.5 ft behind. there is a half wall at that point with pillars on each side about 3.0 ft in from the wall.
The halfwall is 7.5 ft long. I will be sitting 4.5 ft in front on this wall. Behind this wall is a 3 ft walkway.
From the front of the room my seat is 13 ft. I am 11 ft from the from of my L/C/R .I allowed 2 ft in the front from the speakers and tv.
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Pioneer sc-1525
M80 HG Cherry