To all interested, I recommend you Google schumann + resonance + health. There’s some interesting reading there...In asia they use the S.G. to increase well sleep.... I try it but i cannot vouch myself about this effect....
For the sound i can tough.... 😊
To continue my explanation about the S.G. in an electrical grid....
The Noise floor act like an ice on the sea cover erasing the subtle information of the waves ,obstructing the communication....Breaking this ice cover of the general noise floor by introducing a powerful frquence, S.G. frequence, increase the communication between components different specific noise floor, and made possible a better perception of information associated to the sound waves into the ears...But i guess that the S.G. also modify the distribution of pressure zone levels between molecules mass in the air of the room making it more dynamic....I am not a scientist it is only a description perhaps faulty of what i experience....
This citation convey an idea of what i speak about:
…[O]ne of the earliest [applications] of dither came in World War II. Airplane bombers used mechanical computers to perform navigation and bomb trajectory calculations. Curiously, these computers (boxes filled with hundreds of gears and cogs) performed more accurately when flying on board the aircraft, and less well on ground. Engineers realized that the vibration from the aircraft reduced the error from sticky moving parts. Instead of moving in short jerks, they moved more continuously. Small vibrating motors were built into the computers, and their vibration was called dither from the Middle English verb "didderen," meaning "to tremble." Today, when you tap a mechanical meter to increase its accuracy, you are applying dither, and modern dictionaries define dither as a highly nervous, confused, or agitated state. In minute quantities, dither successfully makes a digitization system a little more analog in the good sense of the word.
— Ken Pohlmann, Principles of Digital Audio[1]