they do work, but there are better tweaks available for less money example auric illuminater,Kontac to clean connections, bright star big rock,bedini clarifier etc.
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Yes, and they do work. Most noticeably is atop the input transformers of my tube amps, above/below a Genesis Digital Lens and above the DAC power supply xfmr. Where they make little or no difference is on (my) speakers, power conditioner, pre-amp power supply, pre-amp and ML 20.6 monos. However, apart from the tube amps, I get the same results without the stones by separating the digital front end from the pre-amp by at least 6 feet.