In the sand box

Years ago there was a product that was a sand box with a shelf fitted on top of the sand (I think that was made by Bright Star, as bdp 24 mentions).  I used a pair under my Jadis amplifiers, they were effective at isolating the amps from floor vibrations.  I used play sand.  Seems to me you could make one pretty easily and inexpensively too.  Bdp24's advice is sound, wish I had used silica sand, as the play sand did get a little damp. 

I'd avoid quicksand at any cost.  A few years ago my DAC was swallowed whole, never to be seen again.  Tragically, this incident occurred in clear view of my grandkids.  Counseling can get very expensive.

Grand sand animates the playing of the grand for less than a grand paid by an aging grand.

I like placebo sand mixed with some psychoacoustic pebbles.   Then a pure white quartz crystal directly over the amp's transformer.

I also have a shaman come in and perform some cool looking stuff that aligns the polarity of the electrons.  

Sure, why not.

I’ve put sand in speaker stands for the same reason, to dampen vibration.