I have a question about 'which speakers would be best to put where?' I've got Polk speakers and am currently using the my RT-35's as my side speakers and a single Polk CS-300 as my back speaker. However, I'm moving into a larger room where I'll be able to take advantage of my pair of Polk FX-500i's bi-dipole speakers that have been collecting dust.(that I'll be using in a 7.1 set-up in place of the single CS-300) My listening position isn't ideal. While I have 6' to ea. side of me, I have only a bit over 3' from my seating area to the back wall Would it be best to keep the straight firing RT-35's on each side with the FX-500i's high on the back wall or, should it be the other way around w/the bi-dipole speakers on the sides and the RT-35's on the back wall? Any replies and suggestions would be greatly appreciated.