I was reading about the Polk f/x300i surrounds on the Polk site, and Polk recommends using bipole speakers if the surrounds have to be placed behind the listener. I'm kind of leaning toward a Paradigm Monitor Series speaker system now, but the recommended surrounds for the Monitor Series are designated as dipole. Does Paradigm offer bipole surrounds? The only place I can put the surrounds is on the wall behind the couch. I can't put them slightly to the rear and on the sides, as recommended on the Dolby site.