---Minerals for filtering and protecting from EMI and RFI...
---Ionization...
---Schumann generators...
This is unorthodox...
In orthodox tools ;
---Mechanical isolation/dampening/coupling-decoupling strategy..
---Decreasing the electrical noise floor of the house/room
--- Mechanical acoustic tuning of the room not only passive materials treatment
I am not sure to understand your question...
Any sound perception is linked to our brain and the way it process it...
Anyway it is my answer... And experience...