I got a pair of magnepan mg12 speakers and I heard that it is kinda tricky to position these speakers.Anyway, may question is:how far away from the wall should I place them? thanks all!
When I had my MMGs (almost identical to the MG12s, BTW), I pushed them up against the wall and had no problem. In fact, I thought they sounded better as the walls reinforced the bass, which I found quite pleasing. Every room is different, so feel free to explore by trying a lot of different positions. I don't believe there is one right way to set up Maggies, just what works best for you.
My only suggestion is that you ignore the Magnepan manual and put the ribbon tweeter on the outside and not on the inside as Magnepan suggests. I felt having the tweeters on the outside gave a wider soundstage.