I have just one question for you, which I can't find answer for, so I thought you guys from science might know the answer..
Could vacuum pressure be used in soundproofing?
Let's say, for a recording booth.. two cubes, one inside the other, separated from each other by a vacuum, no mechanical contact between them (floor support only).
Would the vibrations of the outer cube walls get into the internal cube?
To me it seems like this method could work, and that's why I find quite strange that nobody has ever built something that would use this method..