hemigreg OP
geoffkait: "wavelength of 25,000 miles found in the “trough” between the surface of the earth and the ionosphere, has nothing whatsoever to do with acoustic frequencies. "
yes maybe not acoustic but influence all other freeqs passing thru such non vacuum density.. and not really relevant again just an example of over whelming effect vs the power breaker chip label...LOL i see some use. tha air density ,particle contect,o2 concemtration,temp, amd more directly effect the acoustic wave to the ear and can be shown at any given time by calc acoustic impeadance. thats why systems sound so different at different seasons, day/night, altitudes etc.
>>>>>Audiophiles have been using Schumann very low frequency (7.83 Hz) generators lo these fifteen years to produce an electromagnetic wave in the room, improving the sound. While it’s not clear how the sound is improved there are several theories. All the world loves a mystery, no? It can be shown, separately, that the sound changes day to day, hour to hour, month to month, etc. primarily because of (1) the variation in RFI/EMI strength. I.e., Extremely High Frequency electromagnetic radiation, (2) traffic conditions, (3) changes via weather to the electrical AC grid, as well as other factors, many of which are perhaps beyond scope. E.g., changes one makes the the system (whether he remembers making them or not), the number of cellphones in the house at a given time, the number of appliances running at a given time, the amount of old newspapers, magazines, books, lying around at a given time, etc.