Hmm. Thanks for that Craig. I may well do my new calibration something similar to your diagram. I was using a similar pattern to your 'before' diagram, but over just two seats. For my new test I will still do some mic positions 'out in the room' so to speak, but will focus the bulk around the MLP as you suggest.
BTW, I have two *very* big boxes sitting in my hallway with the tops open. The contents of the boxes are currently sitting in my HT room, allowing the electronics inside to come up to room temperature before installation and switch on. I'm not saying what is in the boxes out of consideration for Jerry But the new line appended to my sig may give a clue LOL! I will report back in the appropriate thread when all is set up, calibrated and tweaked.
Congrats on getting your subs through customs! Would like to hear your impressions once you have time with them.
When I first ran XT on my TX-NR1008 I had imaging issues in my MLP by adding my second seating position so I learned to focus my measurements symmetrically around the MLP.