Luc, I'm sure that you'll get great enjoyment from the surround effects that your QS8s will give you. If these are side surrounds in a 5.1 setup the general idea is to have them about 3' above ear level and a little(maybe 2')farther back than directly to the side.

Incidentally, a belated Happy Birthday, and hope that you had a good one yesterday.

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Enjoy the music, not the equipment.