Can do,
/*Well, if you "need" sound all the way down to DC, you have to have a constant pressure source, a pump*/
1)And it can be done, and cause structual damage. I just can't do it because i haven't patented yet, and you need certain requirements for it to work, like 4"min reinforced concrete for starters. And "ALL" building inspectors would not of approve it./*or a fan. Is it useful?*/
2)Thought about this for a while back in the late 80's, using like old pipe organ pipes to re-produce the sub freq. up to -x- freq., but it was in-effienent. The PSI having to be generated vs. the SPL requirements out of the pipes, and the pipe length's envolved.
CONCLUSION:
So your looking at at least $100k min, @480v 3phase, for starters for number 1)"TO DO IT RIGHT".
And in case of number 2)Well you better have room for a certain amount 64' pipes and air compressors, to generate at least what I think was 320PSI to hit 16Hz hard.
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