Yes, I'd like to follow-up on John's and Mo's surround comments. Since you're going to be listening from a position fairly close to the back wall, positioning the surrounds on the back wall is fine, even though they remain side, not back, surrounds. About 6' up and spread as widely as possible,say 6" from the side walls, should give a very good effect. The QSs(QS4s should be plenty)in that position are excellent in displaying their ability to disperse the surround sound widely.

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Enjoy the music, not the equipment.