What are all these metal cans/pods sitting on top of electronics?


John Darko the youtube reviewer has them on all his equipment. I see them on alot of people's electronics it's a tweak of some sort I just don't know what they are or what they do. 

Thanks,
Steve
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Added mass for vibration control, can have a good effect on tubed units and power supplies. Good thing is that you can try and use something without spending a cent.

G
John Darko the youtube reviewer has them on all his equipment.

I would not buy any of these items unless they have undergone cryogenic treatment and quantum cleaning. Be sure their astrological sign is aligned with yours.


And the most important one, sits on the top of his head.

Cheers George 
I’ll hazard a guess that the “mass loading” has more to do with keeping these light little boxes from being pulled from their place by connected cords.
He has stated they are just "paperweights" to keep the small stuff like streamers and DACs from moving with stiff cables. Not "mass loading" baloney.