Phil, the QSs don't have any problem when positioned near the back wall; in fact when the listeners are sitting very close to the back wall the suggested positions are 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. That particular reviewer at least believed, possibly incorrectly, that some aspect of his room arrangement might affect the QSs, but certainly there's no such problem in most cases.

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Enjoy the music, not the equipment.