No problem Craig. As for the distance issue I stand by my original thoughts.
However after thinking about your larger plan a little bit further and there may be some issues with placing the sub into a cabinet built into the wall. Personally I would be concerned with boundary gain issues generated by placing the sub in a built-in structure. I would assume that this is really going to emphasize certain frequencies…but Audyssey XT in your pre/pro may be able to overcome much of this so it may be a moot point.
However I would be concerned with the possibility of causing resonance in the wall itself.
I wish I had these (possible) problems to think about for my own system…