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I use sand boxes under the folded corner horns of my tri-amplified DIY horn speakers. I also use sand damping in the stands for the midrange and tweeter horns.
I am considering building at least one sand box amplifier stand to give it a listen. What I have in mind is a rectangular open topped box of teak veneered marine plywood containing two or three inches of fine white sand. This box will be supported by spikes I will machine from brass or bronze. On top of the sand in the box, and not touching the box, will be a plate, probably constrained layer neoprene between 1/4 inch aluminum and 3/4 inch HDF. The amplifier will sit on that plate.
If any members have experience with using a sand box amplifier stand of this sort or suggestions on the idea I would appreciate your comments.
Follow Ups:
I've not used anything as elaborate as you're suggesting, but I have used sand boxes for good effect with electronics. I like the marine plywood idea - I used regular hardwood with a regular plywood bottom and a floating cutting board on top to support the equip. What I learned really fast is that "dry sand" from the local hardware store is not dry at all - took forever and a warped breadboard before the sand was really dry. Marine ply would have helped.
Thanks for the response. The sand I've used with different speakers I've built is children's play sand from Home Depot. It is never dry, but I clean up a large area of the concrete parking pad beside my house. I spread the sand very thinly and let it cook under the hot Georgia sun for a day or two stirring occasionally. Drys right up.
Yep, that would do it!! When I did it I lived in humid Columbus Ohio and bought the same sand which, in my basement, too 3 months to dry out! Live and learn! :-)
You are on the right track - sand is the best dumping material and probably the cheapest. I helped Dr. Bruce Edgar to put together a sand filled shelf for his turntable. He thought that one inch of sand layer would be plenty sufficient.
Edits: 08/12/15
Hey, EduardG, thanks for telling me that. I discussed sand boxes with Dr. Edgar (online) before building the ones I use under my folded corner horns. He was right.
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