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I am luke warm with these devices. I do use them a lot but I dont think I get a significant "bang for the buck."
Many audiophiles have substantially improved the sound of their systems by experimenting with vibration control. How about you?
I am more than happy after using a signal generator to sweep through the audio range and remove offending objects or do whatever to keep them from emitting audible buzzes etc. As for damping components I have had less audible results. I do believe that if you listen to a high quality system and add pink or white noise, or low level single frequencies through a separate source you can play with the resulting loss of definition and "space". If you consider extraneous buzzes etc in the same context, then vibration damping makes a lot of sense and quite often real audible differences. I used to be far more crazy than I am now, a Volvo 245 wagon received an early treatment of lead sheeting from me as an attempt to lower the noise floor and increase the detail, I am sure it made a difference based on the amount of effort it took to strip the intereor of the vehicle and put in all the lead. I sincerely hope that the eventual owner will never suffer from lead poisining! Now about using mercury,,,hopefully you know where the saying, "Mad as a Hatter" comes from.
I'm lucky to work for a company that makes the best shock-absorber material (used in indoor athletic arenas). Therefore, I have used the material under my tube integrated amp. (Conrad-Johnson), CD player (Parasound CDP-2000), DAC (Camelot Arthur), and turntable (Rega Planet 2). The biggest improvement I heard from the turntable and CD player. No improvement from the amplifier or DAC.
The only vibration control that made any outstanding improvement was with my SOTA turntable. Any other isolation or vibration device that I tried only made improvements that I so badly wanted to hear. I feel that there are so many other more cost-effective ways to spend one's money!
Treating your room to control vibration (absorption & reflection) will improve the sound of all systems. Think of your room like the inside of a speaker---all those myriad reflections need to be controlled in order to have clean reproduction of sound.