AVS Forum Special Member
Join Date: Dec 2008
Location: L.A. - Lower Alabama
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If you're wanting to optimize the front row, then you need the speakers about 54" in front and 54" behind (that should be about 45 degrees). If you're wanting the 2nd row to have a similar experience then you need to move two of the ATMOS speakers behind the second row. Though it looks like you don't have much space.
The idea is to have ATMOS speakers both in front and behind you. If you have a processor capable of more than four ceiling speakers then you would want a row in front, a row between, and a row behind. Just trying to provide even coverage across the top of the room. You haven't said that's the case, so I assume you're stuck with four.
What's the head to head distance between your front and second row?
How far apart are your L/R speakers? As I mentioned before, that's where you need to start for your width spacing. They look too close together in your drawing to me.