Yep, empty cavities have a tendency to resonate. So while you're at Home Depot checking out the kiddie sand, which typically contains pebbles and is stored outside in the damp, for a coupla dollars more splurge for the contractor's grade silica sand, which is dry, uniform and stored inside. In December 1999 Home Depot asked $3.90 for a 50lb bag.
Btw a plastic funnel works wonders for carefully sifting the material of your choice into the stands. Of course, if your stand isn't a sealed, all welded design, as noted earlier the fine sand may leak out without a liner.
Btw a plastic funnel works wonders for carefully sifting the material of your choice into the stands. Of course, if your stand isn't a sealed, all welded design, as noted earlier the fine sand may leak out without a liner.