I never believe that a 10 bucks device will stay at 7,83 hertz...
It is precisely why these cheap device work better perhaps than very costly one...
I bet that their range vary between someting like 10 hertz and 4 hertz around their alleged 7,83 hertz...
At this price is Chinese designer meticulously verify the frequency 7,83 hertz ?.... Asking the question is answering it.... 😊
It is the reason why the dithering effect work....Introducing a random variation around this frequency....
People who sells this S.G. sell the "mythical" non existant exact 7,83 hertz frequency....It is an oscillating average in reality...
Because the earth resonance vary around this frequency and is not always exactly that one and more than that the shumann resonance is a set of peaks around it and his harmonics....Not the single perfect 7,83 hertz....
In nature, from what I read, it sounds like echoes of the Shumann resonance frequency would be somewhat randomized, like echoes one hears of thunder after a strike.
When our kids were little, we ran white noise generators at night to help them sleep better. No resonance but random generated audible white noise (like dither). Worked like a charm! Those devices have been around for quite a while.
It seems we understand each other ....
My best to you....
Remember that i am not an english speaker, then my understanding of subtle humor is sometimes lost in translation...I must admit that i am a bit too reactive also and not alway subtle....
😊😁