Brad,
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What angle would you build the wall at to be most effective in breaking up the room modes? 6 degrees? 12 degrees? I’ve heard both numbers tossed around.
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In a room that size I wouldn't use angles at all. Angles can be useful, but not if it makes a small room even smaller. Also, angles do nothing for room modes. What you might be thinking of is angling the walls to avoid flutter echo at higher frequencies without having to add absorption just for that. But in this room absorption is a better choice.
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Which way would you set up the mix position to facilitate the three constraints above?
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See this:
http://www.realtraps.com/art_room-setup.htm
There's also a video version here (second link on the page):
http://www.realtraps.com/videos.htm Quote:
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Any suggestions for positioning acoustic treatment?
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Not to keep posting links, but it's easier than writing the same stuff repeatedly.

See here:
http://www.realtraps.com/placing_mt.htm Quote:
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Is it even worth it to consider setting up the mix position so that the speakers face diagonally across the room?
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No, and you'll see why in my Room Setup article (and/or video).
--Ethan