Thanks for that feedback, I have the QS8 on the sidewalls 15 feet apart facing each other. My sitting position is right up against the rear wall. I would be placing the rear back right above me. I actually mounted one of my Klipsch SS1 which has a front firing cone with the horns on each side. It sounded really nice on Gladiator, but I must take them down, I just sold them on Ebay. So you are saying that a 3rd QS8 would be the ideal 6th speaker for my setup...