On the other forum it was mentioned that I would need 6' of unobstructed wall to either side of the corner horns for them to work properly. Is that the case? I won't have 6' of unobstructed wall.

Also, the speakers will probably be placed on the 11.5' wall. If the bass is cancelled at about 50Hz (which I assume means there will be a noticable dip in the response at that point), would it be better to restrict the bass output to about 60Hz and then add a dedicated sub to handle 60Hz and lower? I'd rather not go this route, but it sounds like I may not have a choice if I want good bass extension.

I didn't want the speakers to intrude more than about 16-18" (measured directly out from the corner, 45 degress off each wall) into the room. I can reclaim the space (and increase the wife acceptance factor) by using the speaker as a shelf (I know, blasphemy) or by adding a shelf directly above the speaker.

Right now I'm to the point where I'm trying to decide between an Adire HE10.1 setup or the Pi corner horns. My main objective is to build some great sounding speakers don't need to be place out into the room to sound good and that don't take up a lot of space.