I'm trying to decide between picking up a 3802 now or waiting for the 1803 and saving a few bucks. I was wondering if the 3802 can do Dolby Digital EX. It mentions something about Dolby Digital 6.1 Matrix in the features on the Denon website. Is that essentially DD EX? I am trying to make sure my next receiver supports every format possible (I currently have a 3600 with no DTS). Also, is there any advantage in 7.1 over 6.1? Do both surround speakers in a 7.1 setup play the same thing during playback of 6.1 material?