After spending all this time and money attempting to maximize the soundproofing and trying to deaden the sound, what do you use for a door so all of your effort is not wasted? Is a solid wooden door with weatherstripping all that is needed? Anything else? What do they use in the theatre...double doors with mini-hallway in-between? It has been so long since I have been that I cannot recall. What have others used with success in this area?