What are the circular discs people use on components?


I often see these Circular metallic discs people place on their components. What are they and what are they supposed to do? Are they magnets attempting to reduce noise and are these really necessary? 

emergingsoul

Showing 1 response by lovehifi22

Interesting for sure. Does anyone have any advice as to the amount of weight one should use? I assume it’s more for heavy amplifiers and less for lighter components