Acoustic treatment for corners.

Thanks for the ideas. I have two ASC tube traps and a pair of Cathedral Sound Panels in the corner. If you look at Zargon's back wall(minus the bookcase), that is what is behind my speakers-the corner and the open doorway. It seems like the image(or some treble)is pulled more to the open side, or goes further to the open side than the corner side. There is more open space on the doorway side. There is also slightly more distance to the first reflection on the doorway side than to the corner side(I'm afraid I can't do much about that.).

So the differences between an open area and a more closed area with a corner might be due to bass differences and maybe first reflection?

Wow! What a room, Kevinzoe. Without doing the work, what would that mean in inches, for say an ASC tube trap in a corner. I gather that it would be pulled out less than 7.5 inches? Do Cathedral Sound Panels act as a Diaphragmatic bass trap? In my case, the problem corner(closed area) has about 3 feet of wall before it hits a sliding glass door. There is a little bit of improvement with the glass door open.