I contacted Martin Logan directly and this was their response:
Hello James,
You may run into a few acoustical problems with an angled wall. Its going to be hard to say to what degree or extent the problems will be, but realize that it IS an issue that may rear its head. I have never personally heard the Aerius on angled walls, but jsut using my knowledge of our products, I can tell you that they don't prefer it. This potential problem is something that you will have to work with. Try different toe-in angles, different spacing beteween the side and back walls, and/or the relation of your listening position. These are just a few things to "change" if you are experiencing problems with a 45 degree angle. Let me know if you have any other questions.
Sincerely,
Joel Lopez
Joel Lopez
Inside Sales/Customer Support
MartinLogan Ltd.
Oh well, back to the drawing board....