Miracle audio improvement: There are several YouTube testimonies that hearing acuity is greatly improved with the use of psychedelics.
Any conductive flat surface will act as an RFI/EMI barrier. Placing shungite on or around a Schumann Resonator (which just produces dither, not new science or magic) is akin to placing pieces of aluminum foil around a TV antenna to achieve different results. Any ham radio operator can confirm that placing pieces of tinfoil around any radio frequency device will have an effect on its performance. You could probably have the same effect* by using any conductive material.
*DISCLAIMER. Halz has not tried SG's in the listening room and doesn't have an opinion, but may buy a few for kicks. Offer void where prohibited. Discontinue use of reading Halz' comments if irritation or redness results.