But without acoustic control of the room you cannot hope for the maximal manifestation of this quality in a room....In most of the case for sure...
From my OP:
the amp produces a sound stage that is nicely defined and articulate from left to right, but not as much from front to back.I know my room is capable of that sound stage because my tube amp accomplishes it.See where I said, "my tube amp accomplishes it"? What does "it" mean? Well, that is precisely the point where I told everyone that the room has acoustic control over sound stage, including depth. This is why it is redundant and unnecessary to explain (again and again) why it is important to exercise acoustic control. Got that covered. In the OP. And in my comments. Again and again. Now I am really really done making this point.