AVS Forum Addicted Member
Join Date: Oct 2001
Location: Monterey Park, CA
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Can you flip the layout 180 degrees? You haven't got door & window locations in your diagram, so I don't know if it is possible, but had to ask.
In any case, I would place the Side speakers slightly forward of the main listening position (around 80 degrees from centre), for greater wrap-around envelopment and better side-vs-rear separation in the surround field. I would put the Rear speakers around 60 degrees apart on the back wall (150 degrees from centre), to anchor those sounds clearly behind me.
Height speakers should go on the ceiling, around 45 degrees elevation forward and rearward of your main listening position. If ceiling placement is not possible, then mount them as high up as you can on the front and back walls. In either case, they should be spread apart roughly the same width as your Front L/R speakers. Aim all speakers at the listener farthest away (to compensate for distance).
You can get smoother frequency response (fewer/smaller peaks & dips) by moving the seating so that the listeners' ears end up 2/3 room length from the front wall. Bass response can be improved by centering your 2 subs at the 1/4 and 3/4 locations of room width.