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s4p

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  1. Yes, your neighbors really have the problem which you may not experience! I have exactly the same case right now. The owner of hot tub and the closest neighbors have no problems with it but houses far from the source have. The reason is in the physics and I am surprised that no one on the net i searched so far got it as if i am living in the middle ages. The explanation is of course simple: the interference of different channel sound waves while they reflect and deflect traveling in the ground. These noises may reach very distant places, like in my case I go at night to the next block 1000-1200 feet away and I feel how earth is shattering. When these waves sum in right phase the amplitude growing substantially. Since these ducts permanently change you experience zero or very loud noise level. This change acts like you switch hot tub on and off constantly making people nuts. You can take vibration analyzer and see couple peaks around 10-15Hz and 60Hz. First one you do not hear but feel. Second is coming from motors running on 60Hz currents. People living close to vibration sources like highways live 5 years less, children get worse at school, probable also other health problems, see research and even Wiki
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