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good sound walls are .................... ! ! !
two, three or four layers the sound is forced to angle up an away
or
https://www.youtube.com/watch?v=0aGRhEmZaO8I had 4 of these they sent the sound up they were 30 inches with 24 inch fans
this was good enough to not be loud
hmm i thought sound walls were walls on the perimeter of the building kind of like a huge fence but solid but from that video it looks like they are inside the building as part of the ceiling. that would certainly be cheaper to install something like that.