Video, 2 or 3 people wide, you need off-center positioned people to get a full width audio image, these were designed specifically for that
http://www.hifi-classic.net/review/dbx-soundfield-100-135.html
I do not know what modern speakers can create a l/c/r image for l/c/r seating positions , perhaps other people here do.
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flexible toe-in is also a solution (my heavy speakers are on 3 wheels) In my 2 channel setup. speakers aimed directly at my center position (or a bit ’out’ for some content). When listening with a friend, small table between us, I change to:
X toe-in, similar to what the DBX are designed to do: aim left speaker at right chair; aim right speaker at left chair. You are closer to one, more volume by proximity, but get more direct sound waves, more volume by directivity from the other side.
Works!
You would have the option of changing the distance from rear/side walls for either music or video as well.
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