I had my second sub delivered 2 hours ago and have been searching online since..heres what im workin with.. onkyo txnr609, 2 klipsch rf62ii for left and right, klipsch sw450 for current sub. New sub is NXG nx-bas-500. For time being they have to be on front wall same as front left and right. Now on general basis is it better to have subs in each corner with mains closer to tv or subs 1/3 and 1/3 with L&R closer to wall. Or to have sub positioned somewhat behind L&R in corners. I know room size and other variations play factor but front wall only choice currently