I believe people who try it ...
Too much good reviews...
But because i dont buy ready made tweaks by principle and for budget , i devised my own "stone" knowing that a "stone" can affect sound by his properties located beside a transformer ...
Without knowing it i embark on a journey of fun experiments ...
My stone is composed of Shungite plate +copper tape on the external side of the application with quartz to create a balance ... It worked for me so well i make many ...😊