Eddie, with your listening position being maybe just a foot from the back wall there doesn't seem to be much of a back surround effect that a speaker could add. As was suggested, you might try that M22 as a center speaker instead, at least as a comparison. If you stay with the 5.1 setup the QS4s should be positioned either on the side walls just a few inches from the back wall or on the back wall just a few inches from the side walls. In either case place them 2-3' above ear level.

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Enjoy the music, not the equipment.