What's the area around the door like? Anything to absorb sound? It's going to hit the floors, walls and ceiling and dampening around there can really help.

To give you an idea, I had this attic with about a 20' long, heavily insulated area big enough to crawl through and you had to yell to hear someone at the other end. Now that was fiberglass insulation, but it gives you an idea of how absorption around the area can help modulate noise.