Ok, let’s say i wanted to be completely stubborn and recess the sub into the wall regardless. Big surprise right! Is there something i can build inside of the wall to help either absorb or project forward the sound emanating from the top, sides and rear of the sub? Maybe an additional drywall enclosure or some insulation or both? Something else?

Still not sure I'm going to do it this way but want to consider all choices.

Success is a journey not a destination!