I just got an Axiom speakers package with their QS4 quadpolar surrounds: http://axiomaudio.com/1QS4.html Where should these surrounds be placed? Side walls or back walls? How high? I am going to use the mounting brackets that came with them. One problem I have with side wall mounting is one would have to be 7' high to be above the openings to the kitchen. So, it could be side walls at 7' or rear wall at any height. Any thoughts?