do a search under "sand" and this will bring up some info as well as other suggestions.
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I have used playground sand purchased in bags at Lowes. Be sure to let it thoroughly dry before filling. An alternative which I recently tried on a pair of speaker stands is kitty litter. The kitty litter was easier to use simply because it did not require drying. Please don't ask me which sounds better, I don't have golden ears.
I am selling sand that I aquired from Area 51 that you can load in speaker stands or equipment racks that will produce unbelieveable improvement in any system.Guaranteed bass extension down to 18Hz and treble extension to 55KHz,a wider and deeper soundstage than humanly possible,your whole system will literally disappear.It will completely and utterly change your system to that "jaw dropping" sound we've all heard about.Finally you can stop the endless wasting of money on cables and other things that do absolutely nothing.If you buy now,I will include,free of charge,my new book entitled "Alien Sand Tweeks,Fact Or Fiction".Price is $500.00+shipping per pound.This is a one time only price reduction exclusively for A'gon members.Regular price is $725.00+shipping per pound.At these prices,how can you go wrong?Don't hesitate,this stuff will be sold out in a matter of hours.I accept cash only because I have been ripped off in the past by unscrupulous vultures with bogus credit cards and fake money orders.
Play sand mixed with small gauge lead shot should do the trick nicely. The differing density of the two materials mixed together deaden the sonic signature of the rack without emphasizing or de-emphasizing any part of the frequency band thus not allowing the stand to have a sonic signature of its own.
Silica sand it what you are looking for.
Should be fairly easy to find, as it's used for sand blasting (bone dry if stored properly and inexpensive).
Wear a breathing mask/cloth when pouring it as the dust is not something you want to inhail.
Perform the task outdoors.
Research silica sand for your application in order to judge the previous sandbox responses to your query.
The best sand in the world resides on the beaches of Port St. Louis in the Maritius Islands... off the SE coast of Africa.
well... there and the Saychelles.
If money is tight though... Palma de Majorca will probably do almost as well... off the S coast of Spain.... and the night life is better.
take along some sealable freezer bags and SPF 40.