Given (1) the reported effects of these waves on humans and (2) the 7.83Hz frequency is well below the bottom of the audible audio band, it seems to me that any effect it has on perceived sound from an audio system it more likely to be caused by its effect on the listener than by its effect on the sound in the room or on system components. I posit it is likely it is the well-being effect of the waves on the listener that is improving his/her perception of the sound quality. His level of well being has changed, not the sound.
Another aspect that has not been touched on here is the the volume of the output. Does the beneficial effect increase as the volume of the waves is increased? If so, is there some limiting point?
Some postings state adding further generators causes bigger improvements in perceived SQ. So it could follow that higher volume from one generator could do the same. Since signals at this low frequency are very non-directional, I posit that one high volume generator will have similar effect to multiple lower volume ones.
Moving on, when I can again eat at a top restaurant should I take a Schumann generator with me? My perception of the quality of the food may rise as a result of my heightened feeling of well being. Other diners may remark on the difference.
While I am in bed with my wife......
Should I carry one at all times?