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Any experiences using a large Sandbox platform for speakers? I know many are used for turntables

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cfb

and vacuum tube gear but I've not seen much on using a large sandbox platform for speakers. I've heard of a few very high-end systems out there employing such a platform mostly to control rooms that have suspended wood floors. I believe that Serbian designer Alex Radisavljevic of Raal Ribbon fame uses such a platform in his reference system.

The idea is a very large sandbox say ten to twelve feet wide by three feet and six to eight inches in height. Large enough to place both left and right speakers on at their proper separation distance. Obviously, this would not work for cat owners. To contain the sand, the top could be covered with a layer of cork and then use spikes under the speakers such that the spikes pierce the cork and imbed in the sand below. The cork membrane is used to seal up the sand and prevent a mess.

Has anyone here built such?

Follow Ups:

RE: Highly recommend doing as shown - amioutaline? 09:57:19 08/01/12 (0)
I had a trampoline floor some time ago and put these large speakers on sandboxes, 4" deep with top plate floating. Wonderful increase in mid-range clarity.

LIBERTY ONCE LOST,
IS LOST FOREVER
-JOHN ADAMS
Do you live by the L-train tracks? - Jay Buridan 13:03:44 07/23/12 (3)
Do your floors shake?
- No trains, but you can feel a truck go by on the highway 600 feet away. It's an old 20s Sears house. - cfb 13:37:45 07/23/12 (2)
  The joists are all oak and boy are they hard as rock now. Constructed back in the day when a 2 by 12 really meant 2 by 12.
  - RE: No trains, but you can feel a truck go by on the highway 600 feet away. It's an old 20s Sears house. - 6bq5 12:11:01 07/25/12 (1)
    If you can get to the basement, I might damp the floor -
    there are a couple of ways - cut up blue board (an acoustically dead drywall product)and secure it to the sub floor - liquid nails...
    then cross brace the joists or add a sheet of ply + drywall to the bottoms of the joists to damp the bottom edge of the joists...
    
    I would think that if the speakers can generate decent LF signal, it might cause the sand to move around, and if you 'floated' the speaker, could cause the float to drop and push the sand out of the box...
    
    Happy listening
    - RE: No trains, but you can feel a truck go by on the highway 600 feet away. It's an old 20s Sears house. - amioutaline? 10:00:46 08/01/12 (0)
      "I would think that if the speakers can generate decent LF signal, it might cause the sand to move around, and if you 'floated' the speaker, could cause the float to drop and push the sand out of the box..."
      
      That's hilarious!
      
      LIBERTY ONCE LOST,
      IS LOST FOREVER
      -JOHN ADAMS
You better have a really good suspended floor - rickmcinnis@dogwoodfabrics.com 20:33:07 07/22/12 (2)
That sounds like a great idea if your floor doesn't collapse.

With the depth of sand needed for it to work that would be really heavy.

Brian Wilson would beg to come over to your house with a sandbox that size.
- Well, 12' by 3' at six inches would be 1,800 pounds of dry sand or 50 pounds per square foot. - cfb 05:31:11 07/23/12 (1)
  Standard residential floor is a minimum of 40 psf, so it would depend on the individual floor involved but if it was old construction 2 by 12s placed 16� on center with a short span it might be OK. However, I wouldn't go putting aquariums or say a safe in the same room.
  - If you feel good about it I think it is a brilliant idea - rickmcinnis@dogwoodfabrics.com 09:41:17 07/23/12 (0)
    I guess three inches would be enough.
    
    I like the way you think!
    
    I use much smaller sand boxes beneath my turntable stand, equipment stand and my edgar speakers which includes two seismics and the weight of all that has me wondering when it all ends up in the basement.
    
    Been there for ten years so I guess it is OK.
    
    Looking forward to hearing about your result.
About 15 years ago I build granite in sand boxes for my speakers. - Norm 18:24:28 07/22/12 (0)
I see no purpose in making them big enough to take both speakers. I got 3" thick granite and about 28 by 32" blocks and about 1/2" larger than the blocks and 1" deep with about 1/2" sand. The granite did not ring thanks to the sand. They were pretty good.

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