Ok, so i only have three speakers hooked up to my Pio Elite 92 right now. I sold my Towers and i'm using my rears up front until i get my new ones. The thing is, on the front of the receiver, it's still showing all 5 channels and a sub. I only have three hooked up to it with no sub. Is it normal for this receiver to show this even though only 3 speakers are hooked up?