Almarg,
You stated, "FWIW, the OPs path is not one that I would personally follow. It suggests the possibility that a multitude of small inaccuracies were both originally present and subsequently introduced, which after a great deal of time and experimentation have been made to essentially cancel each other out. If I were not satisfied with the imaging/dimensionality/holography of my system, consistent with some of Onhwy61s comments I would focus on speaker placement ..."
There were no "inaccuracies" present or introduced that "cancelled" each other out. With all due respect, frankly, I find this a very odd statement. Especially the idea of introducing inaccuracies and cancelling out. I have a problem wrapping my head around this one. It is a complete misconception. I am not talking about inaccuracies. I am talking about improving the holographic imaging and other parameters. There was nothing "inaccurate" about the sound before these improvements were made. The sound was as accurate as it could be at that time given the nature of the system that was then in place.
When you introduce a second power cord in series with a Bybee AC Purifier, for example, you do not introduce an "inaccuracy" into the system. If anything, the sound becomes more "accurate", if you care to put it that way, because some of the AC has been cleaned up. The end result of all the improvements is a much more "accurate" sound. If anything has been cancelled by this process it is only one thing -- the lack of earlier "accuracy" due to distortion caused by dirty AC.
Off-axis listening in the "new improved" system is phenomenal. You can sit or stand virtually anywhere in the room and hear the same holographic image.