what about phase cancelation with subs in that wall/door space?
Directional subs work very well in a large open area.
As soon as you start to put them "inside a box" (room), all sorts of things start to change.
The distance to other walls can greatly affect what happen if the wall was not there.
Simple directional models do not always work in an enclosed space the way the model says that it will-due to the boundaries.