How far away from the wall should the O-3s be?
My great room is 20x30 and separated into two levels one of which is 30" above the other. How would it work pushed close to the short 30" wall? How much spacing does the rear bass ports require from the back wall?
Blazin's O-3's have the ports in the front, so there wouldn't be any issues. And the height of the O-3's is supposed to be 36", which means that they should clear your short wall. I don't think that there would be issues as long as they clear the wall, but Danny would be the best person to chime in.
As for the optimal distance from the typical wall, I've found w/ the O-3's and the X-Omni's that 2 feet work for the most part, but you're safe when you reach 3 feet.