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Sand Box Amplifier Stands

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Posted on August 7, 2015 at 17:38:18
Don Reid
Audiophile

Posts: 886
Location: Rural NW Georgia
Joined: February 2, 2001
Contributor
  Since:
April 1, 2010
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.
I dream of an America where a chicken can cross the road without having it's motives questioned.

 

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RE: Sand Box Amplifier Stands, posted on August 12, 2015 at 21:18:15
EduardG
Audiophile

Posts: 284
Location: So. Cal
Joined: May 30, 2002
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.

 

RE: Sand Box Amplifier Stands, posted on August 13, 2015 at 12:16:53
SteveBrown
Audiophile

Posts: 2454
Location: Portland, OR
Joined: November 14, 2002
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.

 

RE: Sand Box Amplifier Stands, posted on August 13, 2015 at 19:16:28
Don Reid
Audiophile

Posts: 886
Location: Rural NW Georgia
Joined: February 2, 2001
Contributor
  Since:
April 1, 2010
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.
I dream of an America where a chicken can cross the road without having it's motives questioned.

 

RE: Sand Box Amplifier Stands, posted on August 14, 2015 at 20:41:38
Don Reid
Audiophile

Posts: 886
Location: Rural NW Georgia
Joined: February 2, 2001
Contributor
  Since:
April 1, 2010
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.
I dream of an America where a chicken can cross the road without having it's motives questioned.

 

RE: Sand Box Amplifier Stands, posted on August 14, 2015 at 21:13:37
SteveBrown
Audiophile

Posts: 2454
Location: Portland, OR
Joined: November 14, 2002
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! :-)

 

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