Thanks for the replies. To deaden the room I will use 2X4 furring over the masonry, filled with acoustic sound deadening fiberglass insulation (more dense fiberglass batts) with fabric over the top. I guess I was wondering if the front wall should be reflective to give a depth to the sound. Why is it that speakers should be placed a few feet from walls? I kind of thought that the front wall and maybe the first few feet of the side walls and ceiling should be reflective for this reason. You are saying that Imaging would be better in a dead room?
