Anti-vibration balls for hifi racks

Kiln Dried Sand is the substance required. 

In the days of old, some would suggest a mixture of grain sizes was the best formula for Sand Fill. 

The Science for Kiln Dried Sand is that each grain is independent, and Kinetic Energy will attempt to transfer into each grain, resulting in energy transferal dissipating efficiently. 

The Frame for the Rack must be recognised to have a ring when Kinetic Energy is present. 

Sand seems like a good and inexpensive solution. I have no personal experience with following product, but it is marketed for this purpose: Atacama Atabite SMD-Z 7HD Inert Filler. I imagine there are others. 

Johnny Cat.  But just don't tell your cat.

With lead shot, it's easy to overdamp.

@pindac 

Good information 👍 

You can get clean dryed sand from fish, fish tank stores, its safe for fishies so safe for you. various grains as well. Its probably the easiest place to get clean dryed sand in bulk that has no bug eggs etc.