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

are these really necessary?

Yes. They are very necessary. Buy as many as you can afford.

I 2'nd the door weights on Amazon. They are actually called door stoppers. Type in the search bar : Stainless Steel Door Stopper (3 Pack). I use them with great success. Enjoy ! MrD. 

Are you referring to the Combak tuning disks that were popular back in the 80s and 90s (and for all I know, today)?  They were gold-colored circular discs.  They did not damp things, but supposedly tuned resonances to a different frequency.