Bub, what you're discribing is classic frequency cancellation.
With concrete walls and no soft furnishings to absorb the energy you'll get almost total reflection of the sound back into the room. You'll have large areas where the sub cancels out and other areas where it adds and seems boosted. You're just moving your couch from one to the other...
I have to move my wife from her apartment in Overland Park Kansas in to the new place by Thursday night because we have a moving trailer being delivered to our place in Iowa on Friday.
There's something about that statement that just sounds wrong...