You will find it a real challenge to wring the best sound out of a square room. It probably won't matter much if you can limit bass to about 50 Hz and above and not try for anything lower, or if you are playing music at low listening levels only.
From my own experience, treating a square room will only get you so far. What are you willing to accept in terms of a compromise?
A couple of ideas: if the room design permits you might try locating the speakers in the diagonal position; that is, with a corner in between the speakers aimed at the opposite corner. Makes the room effectively larger and supposedly reduces some of the nasty nodes. Personally I have not had success with this method but others have reporthed that it has worked well. A near field listening position might also be helpful.
Also, you might try placing your speakers in the corners. There are speakers specifically designed for this - Audio Note Ks might work well but they are a little pricy. I suggest that you find a pair of good condition used Snell Ks or K IIs (NOT IIIs) and try them first. They are the speaker that the AN Ks are based on, and they will get you to about 80% of what the AN speakers will do for under $200 or so. There are other speakers that might work well in this scenario but I have not perspnally tried them: Linn Kans or Dynaudio 42W or 52W. I would advise that you stay away from horns in a room of your size. I'm sure that others can recommend more.
From my own experience, treating a square room will only get you so far. What are you willing to accept in terms of a compromise?
A couple of ideas: if the room design permits you might try locating the speakers in the diagonal position; that is, with a corner in between the speakers aimed at the opposite corner. Makes the room effectively larger and supposedly reduces some of the nasty nodes. Personally I have not had success with this method but others have reporthed that it has worked well. A near field listening position might also be helpful.
Also, you might try placing your speakers in the corners. There are speakers specifically designed for this - Audio Note Ks might work well but they are a little pricy. I suggest that you find a pair of good condition used Snell Ks or K IIs (NOT IIIs) and try them first. They are the speaker that the AN Ks are based on, and they will get you to about 80% of what the AN speakers will do for under $200 or so. There are other speakers that might work well in this scenario but I have not perspnally tried them: Linn Kans or Dynaudio 42W or 52W. I would advise that you stay away from horns in a room of your size. I'm sure that others can recommend more.