This quesstion is concerning the Surround Back mode. I noticed on my 4ES that there is still surround information in the back surround speakes even when SB decoding is set to "OFF". Shouldn't these speakers only engage when the Surround Back mode is "ON"? Is this a normal for the 4es or is the only way to turn them off is to go to the set-up menu and select "NO" for the surround back speaker each time I would like to listen to regular Pro-Logic or 5.1? Any help would be great! Thanks.