Schumann Resonator


I got 2 of these from Amazon...careful that free returns are applicable.  I charged them up, turned them on and holy moly.....they do help with my system.   What I hear is clarity....space between instruments, a definite difference in upright and electric bass, wider soundstage...you know...all the good stuff. At first I thought it might be increased brightness, but no....it is still the same in that regard.  I still can't believe it, and will listen again tomorrow (saved the packaging for the return)...but today, I'm about to keep them.
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@oldhvymec it’s EM radiation at that frequency/wavelength, not sound. Nothing to hear and outside the frequency range your eyes can detect so you will never see it either.

https://sites.google.com/a/coe.edu/principles-of-structural-chemistry/relationship-between-light-and...

7.83 Hz has a wavelength of about 38,000 kilometers which is WAAAY off to the right in this chart,  well past EM  wavelength of radio waves. 
It’s a Yiddish word (  קיביץ ) actually that translates roughly to “speak informally”.