I have a closet door in my theater that opens up into a concrete area on the underside of my front door stairs. It is probably about 12ftx6ftx10ft in volume.. Couple quick questions: -if I made it into in IB, would it be loud outside where my front stairs/door are? Wouldn't want people outside to hear the bass. -does the area have to be completlely empty and sealed? -does it matter that the front baffle would face an open area behind the seating postion? -dual tumults?