Thanks it is good to know for anyone...
Now try some quartz or herkimer diamond near the shungite or in his place at some point to reach an even better balance ...Experiment and listen to aim at the right balance and spots...
Shungite tend to compress sound ... ( it shield from EMI too )
Quartz tend to decompress it ...
balance is key ...
I put shungite between tubes and tranformers on my Wavac EC300b as well as on top of all my power supply transformers. Clarity and Impulse!