If that back wall was completely open, I agree some treatments behind the speakers would probably be required given they are so close. I've tried it. I still have rockwool panels leftover, but it really does kill a lot of what makes the dipoles enjoyable. Or it might be just because I am used to it, since the Maggies replaced a pair of Definitve Technologies bipolars before them. Given they are kind of closed in to begin with I don't think the additional damping is needed. YMMV. 12 feet from the back wall LOL. Room is only 14 feet wide. I've spent many, many hours playing with speaker positions. It's all a compromise of course, but I think where it is is pretty much the best (for me). I have plenty of hand drawn maps with various distances and opinions. They are now in the spot I have marked on the carpet with tape so I can put them back exactly there. If I move the Maggies out further, then I have to move the subs out further because otherwise they will be behind the panels. And moving the subs out further hurts the bass. I find the relationship between the subs and the Maggies is more important than the relationship between the Maggies and the wall. A lot of people think traditional subs don't blend well with planars. I'm actually quite happy with how it has worked out. Of course, I'm effectively listening to them in nearfield in such a small room. Some people hate planars in nearfield. Again YMMV.