I have an SACD on the German MDG label that is not only 5.1, but incorporates what they call 2+2+2 recording. According to the liner notes, if one mounts two loudspeakers above the L and R Front speakers, and feed the center channel to the upper left speaker and the subwoofer channel to the upper right speaker, it will create a more 3D sound field. This seems bizarre to me. Has anyone tried this?
There is some more information about the 2+2+2 recording on this page (which is in German) - http://www.mdg.de/frame2.htm
There is some more information about the 2+2+2 recording on this page (which is in German) - http://www.mdg.de/frame2.htm