Thanks for all the feedback. I know that stand mounting these speakers would be ideal, but I'm hoping to get a good result from desktop placement. If that didn't work out and I had to go the stand route I could, but this is my first choice. Tyler's mention of the sheer size of the speakers is probably something to note for most desktops, but truth be told I had already been looking at passive speaker options that were even bigger than these, so that doesn't bother me. In fact, given the way that the speakers curve up towards the top, I think they will seem smaller than their maximum dimensions.
I still haven't found the expanded manual for the AC200, so if anyone has a link, please pass it along. Thanks!
Jeff