Anthony, welcome back. Sure, placing the QS8 forward of the listening position will work if there's no other option. For a 5.1 setup with no back surround speakers it's best to have the QSs farther back(say 2-3')than directly to the side. How far back would the left QS8 have to be if behind the hallway? Or, is it feasible to mount it on the ceiling in the hallway area?

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Enjoy the music, not the equipment.