Jason, as John pointed out a 7.1 receiver can be used in a 5.1 setup, you just don't hook up as many speakers and your receiver will show no rears for now.

Just so your clear, in a 5.1 setup you don't have "rears" you have "side" surround speakers. You would not hook up the rear channel speakers for a 5.1 setup and your "side" speakers would be to the side of the listening position, not behind you.


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