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Isolation for Granite Surface Plate

I see from other threads that using a granite slab as a surface plate for a turntable is problematic. I am currently using a .75 inch thick slab as the top of a Zoethecus rack.  It is isolated from the rack by 4 Hudson 1.25" diameter silicone 20 duro bumpers. Can I do better with a different isolation feet? My wife is very happy with the way this setup looks, so I'd like not to replace the top shelf with a different material if I can avoid it.
oldskoolmark
noromance's avatar
noromance
9,833 posts
 
Granite sounds bad. So does Sorbothane. 
Get a chunk of maple and Nobsound springs. 
petg60
1,486 posts
 
I cannot tell about springs as i have not tried them but believe the ones who did.
If not fancied to above esthetics a possible solution would be solid aluminium up to 1 inch thickness sitting on elastomer material covering entire surface underneath. Much better than granite.

G


williewonka
3,075 posts
 
@oldskoolmark - I believe you can get MDF in different densities, but it is a special order from specialist outlets.

I buy mine from Home depot - it works well

I wouldn't worry about it because using materials having different densities with some type of absorbing material between them is the important part.

For the sorbothane I would recommend a DURO rating of 40-50 because  softer products will not dampen effectively.

Regards - Steve
art_boston
45 posts
 
"half inflated" kids scooter innertube

I used something like that in the '70s when making holograms, with equipment mounted to granite plate. Worked great for isolation, I'm sure it would work for audio use.

Simple and cheap!
slaw's avatar
slaw
21,663 posts
 
You could try a sheet of thin vinyl based damping material, available at 
 www.partsexpress.com 
Self adhesive.


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