Demetrios, if Denon finds out that you want to know more than they're willing to tell you in the manual, they'll be very angry with you! Okay, just kidding, but it doesn't seem like there's much more to say other than if you have no speakers connected in other zones there's no need to make any zone settings and if you do, they have no effect. If there's some point that we're missing, maybe another 3808 owner will comment.

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Enjoy the music, not the equipment.