I've owned my 990 for awhile, but have always used it in a 5.1 setting. Now that I've moved, I use it in a 2.1 setting (front mains and a sub).

One thing that bugs me is that when I go to set speaker size, my 990 won't let me set the center channel to "none", I have to select small or large. I saw that other people had this problem years ago, but in the 200 pages of threads, I didn't really find any answer.

I have the latest software update, so I wasn't sure if there were any other work arounds. About the only thing I can think of is just set "Stereo" as the default surround mode for all inputs.