Is my room OK for Magneplanar 3.6's

If possible in a room that size without being in the way, you might try a less commonly advertised but highly effective (for best sound) alternate placement strategy for the Maggies for best results. That would be about 1/3 to 1/2 way or so into the room and only a foot or two from sidewalls. You have to play with exact placement within these parameters to get optimal bass results.

Otherwise they may work but not reach their full potential with the more conventional placement closer to the rear wall for bass re-enforcement in a smaller room like that.

I agree with Schipo. I tried to fit the much smaller MG12s in an 11X13 room and felt it was too small a space. They need room.

I tried 3.5s in a similarly sized space many years back and could never get them to behave properly.

Not even close. Go with the 1.6 or 1.7 instead

Square? wrong shape.
I think I made that answer in another LD thread.

Sorry, man, I simply think you've got the wrong room for the right speaker.

You may be able to make MMGs work.....save a BUNCH of money and have full upgrade credit for a year, so if you want to than, you can trade UP to the than new 3.7s

I've had panels in as small a room as 100ft/sq and it was miserable. And that was with MG1s.