Sure Max, if you placed the back surrounds about 5-6' back and separated by about the same amount, the back surround effect should be significantly better. The side surrounds should be directly to your side, but yes, moving them a little farther away should help a bit with dispersing the sound. It's also good to have the surrounds about 2-3' above ear level, if possible.

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Enjoy the music, not the equipment.