Weights on top of equipment to dampen vibration

I've got a pair of the VPI Magic Bricks also. Placed atop the power transformers of my main amps the result is an instant and profound improvement in overall focus. The Bricks contain a grain oriented iron that perhaps redirects the x-former's flux away from the rest of the electronics, or suppresses eddy currents within the x-former(or both). I'm certain the weight helps dampen vibrations too. Atop the output x-formers there is no difference at all. These were the first "tweaks" of their type that I tried(years back), and was astonished. I wouldn't think of parting with them.

Walker Audio Resonance Control Discs work well. Also, Marigo Audio Lab's Black 6mm VTS Tuning Dots--although they don't, actually, go on top of the component--are effective at dampening resonances. Small pieces of granite glued to wood (and not necessarily just maple) with the granite side down are effective, as well, for a "home-brewed" solution.
And, of course, VPI Magic Bricks are great on transformers, usually.
The danger with the use of any resonance control devices is overdoing it and over dampening the component in question, killing the life of the music. I'm an "ubertweak" and have tried just about everything over the years. . .
But, occasionally, I have run across a product that sounds best with absolutely nothing at all (like my Viva Solista) no matter what I've tried.
I completely agree with a comment I read posted once by someone I apologetically can't remember that, if one gets the acoustics, resonance control and AC delivery right, any halfway decent complement of components that interact well with each other can be very musical.

I use coated solid scuba weight belt weights. Completely dead with no resonance.

A scrap of Corian countertop or marble works well on unvented gear. I use a slab of corian on top of my
CDP.

I use the KISS theory
Normal 15lb dumbells on top of each transformer ..works for me