Jim, from your description there doesn't appear to be any cause for concern. If you'll be using the QS8s for side surrounds in a 5.1 setup and won't be using back surrounds for 7.1, the QS8s should be on the sidewalls about 3' above ear level and maybe 2' farther back than the sitting position. The distance of side surrounds to the back wall isn't a crucial factor.

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Enjoy the music, not the equipment.