It helps if the room is dedicated to audio. You have a couple things working against you. The distance of the maggies to the wall behind them. The distance between the your ears and the wall behind them.
Pulling the maggies out 54 inches into the room will help. Then start pushing them back until either the soundstage (Depth especially) collapses to an unacceptable point, or bass suffers too greatly.
And since the room's dimentions are finite, with the maggies out into the room, you won't be able to move your listening chair out too far. The way around this is to treat the wall behind your ears with something absorbant. This helps with two things. With your ears that close to a reflective surface (Rear wall) you're going to get some smearing of treble detail. It may even fatigue you. Any thin cloth behind your ears will alleviate this. The other problem with the rear wall is bass energy will be reinforced (mild boom at some freq). A thin cloth will not absorb bass satisfactorily (it didn't for me). So you'll need to pad the cloth treatment with more material. I suggest multiple layers of fiberglass available from your home improvement store. It will be concealled.
1.6s will work with these treatments in that room size. 12s will sound nearly the same, be more tube-friendly, and won't create as much excess bass energy. If you have to consider the 12s do to room decor, or budget, happily choose the 12s and do not look back.
