Do you have all those things needed for your amp assigment? It could eliminate other choices. LFE+Main is fairly easy to implement on a case-by-case basis, altho you would have to change it manually when you don't want to use it for something else. Don't confuse LFE and bass management....\n\nNo, I only have 5.1 speakers. But there was some reason why I had selected 7.1Ch+ZONE2\/3-MONO, but I can't remember what it was, sadly.