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Sandbox Design Advice

I understand the recommended design is to build an open wooden box plus a loose lid (possibly granite) which is slightly smaller than the internal perimeter.

Fill the box with kiln dried sand, float the lid on top of the sand and then component on top.

Heavy duty sorbothane feet for the box.

There were a few design details i couldn’t find on the forum and so pl can anyone advise on:

  1. what size should the gap be between the lid and the perimeter?
  2. how deep the sand should be for a 52 kg power amp (114lbs in old money 😀)?
  3. i am going to use a carpenter to make it for me (pine?) and would like a professional finish in black - any suggestions? 

thanks very much - advice is much appreciated.


soma70

Showing 2 responses by bdp24

bdp24's avatar
bdp24
9,509 posts
 

For the sand, look for Silica. It’s a non-organic man-made product used in sand blasting. It comes in many grades (the size of each particle), from powder-fine to somewhat coarse. I used No.60 in my Bright Star Big Rocks, just the right grade imo. I found some at a local construction supply yard, less than ten bucks for a 50 lb. bag.

If I remember correctly, the Big Rock was about 4 inches deep for the biggest model, half that for the smallest.

bdp24's avatar
bdp24
9,509 posts
 
Bright Star used a space of about 1/2" between the floating platform and the outer box of their Big Rock. In that space was placed a length of foam, to cover the sand. The Big Rock was made of MDF, but I'd use something stiffer for the floating platform, like a layer of Baltic Birch and another of granite, with constrained layer damping between the two. Check out ASC Wall Damp. 
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