Room Too Dead

Hello All,

I am looking for advice and ideas on how to condition my Home Theater room.  I built the theater in my unfinished basement.  The foundation walls are covered in insulation and vapor barrier.  Instead of construction walls to cover them, I chose a "pipe and drape" to cover the walls.  I believe that the room is too dead.  It seems to affect overall soundstage in the midrange range.  Does anybody have experience with this problem and ideas to add a little "excitement" to the room?  Thank you all.