I think it is important to know the history of this device which to many magically appeared. It can be traced to the work of Dr. Robert Beck in Los Angeles. He deserves the credit and explains the relevance. My theory is how it works is based on Radionics, look that up, generally considered a pseudo-science. It affects the biological organism, not anything acoustic. He’s not published except in some old Borderland Research Journals but I urge you to search for his Youtube videos. I attended his seminar in Santa Monica in 1985 and met with him several times. At one time he worked in the Navy "Skunkworks" and had been Chief of Radiological Security for the city of Los Angeles. He was the first person to measure and actually record the Earth’s Magnetic Field. This proved the calculations of Schumann made many years prior at 7.83Hz. With his pocket EEG device, he traveled the world measuring brainwaves of Psychics, Healers, Prophets, and Monks. He found that when they "did their thing" their brainwaves were synchronized with the Earths. Dr. Beck freely shared his designs for VLF circuits and antenna not to mention things like the Lakhovsky Multiwave Oscillator and other electronic and Radionic devices. His own research into electronic healing is fascinating and his device the Brain Tuner was featured in a renowned article in Omni magazine relating how it saved Pete Townshend from heroin addiction. Dr. Beck’s associate Ed Skilling offered a number of electronic healing devices. The Brain Tuner is still being sold. He can also be credited with brainwave measurement and Bio-Feedback. Here is one of his Youtube videos full of health information. No audio tips here.https://www.youtube.com/watch?v=8KkEPPl2IWQ
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.