Theater 4's work best against walls. They're horns, and being more directional than direct radiators makes the placement rules a little different. Best placement is on the floor and against a wall. If placed in a corner, angle it in so that the horn isn't pointed where you'll get reflections off the side wall.If you put the speakers in a corner and angle them in 45o, the corner of the room makes the bass dispersion pattern equal the treble dispersion. You won't have side wall reflections because the tweeter flare pattern is within the wall angles. That's a very good placement option for 90o horns.