There seemed to be a lot of interest in my REW graphs over in the Official PSA thread (Thanks guys!). So much so that it started detracting from point of that thread. So I've moved it here.
Attached are graphs of all locations I've tried with my subs. There is no smoothing and db/hz is spaced as suggested by basshead (thanks!)
These are subs only- no mains. They are level matched via the REW SPL meter.
I have dual XV30fs- yes I will post some pictures ASAP. .
I've pretty much got to keep subs against the front wall, so these tests consisted of sliding them in and out from center. The farther out (towards the side walls) the worse the response got. The closer in, meaning both cabinets are just a few inches from each other, yielded the best results. The closer in, the better things got.
I also tried the same 'exercise' with ports facing each other. I got the same result. The closer the two cabinets were to each other in the center of the room the better the graph got.
For kicks I put each sub on it's feet, standing up in each corner of the room. Not nearly as good as centered almost touching against the front wall.
I have one possible option left and that is to move the subs to the side walls, in the front portion of the room. I'm going to try it and see what happens. It would have to be damn good for me to compromise the room with sub placement where it will stick out and be in my way.
There is a graph of all the tests I did. Then a graph of port facing port and port facing wall. The last graph is of the port facing port best locations and the port facing wall best locations. Not much difference.