Edit: meant to post this in the Orbit Shifter thread. I have dual OS LFUs and just ordered 3 212HTRs. Current mains are Energy RC-70s.
Well, I moved the subs all over the room last night. I laid them down on their sides at the front wall and frequency response was not consistent. Then, I couldn't get my fingers underneath them with the low pile carpet to attempt to pick it back up upright (where I can slide around easily with furniture sliders on the feet). So, I pushed them around on the floor which was daunting task. I finally ended up with decent response fairly nearfield. I put the mains on the corners and tilted them down to the listening position. I then ran Dirac adding a house curve and then added 10 db back into the subs on the levels and then ran REW. The LPF is set to 80 hz. The sub gain is 12 o'clock, as is the crossover and the LF adjust. Didn't need to mess with the delay since the subs are pretty identical in placement currently (I did experiment when I had the subs about 4 feet separate and clearly saw the difference in the response with and without).
Long story short, the response is pretty flat. It sounds pretty good, but I'm not blown away by my results, probably more attributable to my "weak" mains.
On that note, I ordered 3 212HTRs from Jeff today.