The sub will more than likely be best in the rear left corner. Put the sub on the couch and crawl around like us other idiots, but I'll lay money on that corner.

Probably a slight toe in on your M60s wil help, just 5 or to 10 degrees. I had mine toed in a little much (almost pointing direct to listening position) and moving them back really helped.

Dave

M60s, VP150, QS8s(3), SVS PB12-isd, Denon 3805, Emotiva UPA-7