Hawk, I take it from your reply that you're talking about using two QS8s as back surround speakers in a 6.1 setup. If so, they should be positioned at least 5' behind the listening position and separated by at least that much. The recommended height is about 3' above your ears, but this isn't critical. If a ceiling mount is necessary, it should work well, but I can't really tell from the pictures and diagram exactly what spots are good in relation to the couch.

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Enjoy the music, not the equipment.