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In the Forum: Audio Discussions
In the Thread: Mastodont DIY Rack: Wall Mount?
Post Subject: Stoned beaingsPosted by N-set on: 12/3/2013
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 Jorge wrote:

For some reason I cannot post pics, they wont upload to the server so I cant select them.

The way Aurios work is with 3 ball bearings rolling inside a round chanel, something like an inverted doughnut...top and bottom.
On the center they have a bolt that allows for some movement but wont let the whole contraption get dismanteled, in case, lets say, of a big hit on the side.  Each ball bearing is held in place by a thin plastic circle that hold the bearings in a triangle shape.

The main thing is they work very nice and slide sideways with a lot of ease.
There is no way they will damage the bottom plate of any piece of equipment, imho.
They couple to the shelf, with a big area and some felt, and to the equipment on top with a ball bearing: I have used a small brass cone here and heard no change.


Hard to imagine without a picture. What does the ball touch at the top? Directly the equipment or another puck? This felt below the lower puck doesn't sound right to me: one wants here very hardcoupling to the shelf to set the ball in motion with a slightest micromovement.

 Jorge wrote:

I dont use the sand inside the posts that make up my rack,  I could, but I see no need just yet.I used pretty thick material.

If you ever feel need, be carefull!

 Jorge wrote:

...
The idea was to use them temporarily untill I ordered some Marble or Granite shelves cut to size.
I havent got around to ordering the heavy shelves...


I'd avoid granite. It rings.

http://www.newport.com/Granite-Optical-Structures/139776/1033/info.aspx

Marble...maybe but a selected one. If you go through all the stone pains why don't you rescue some

vulcanic slate from n old biliard/snooker table like I did? There is  reason English snooker players moved from once traditional

marble tables to vulcanic slate (Itlian slate) ones. Better damping. And the color!! My pics don't do the justice to the stone,

it's just hypnotically beautifull, with absolutely no graveyard pretensions! Some people even think it's plastic, until they touch it.

 Jorge wrote:

For my TT I use a 2 inch slab of Maple, I detach it from the shelf with Sorbothane, and form the TT plinth with Brass cones.
It works pretty good and it is still sensitive to added weight on top.   If I jumpt right next to the rack I will hear a thump if the record is playing.
My listening room is made of brick and mortar with concrete floors.

How is sorbothane working under compression? Does it leak? Would you please share some technicalities:
which duro sorbothane, which thickness, how big mass it supports and through what area?

Cheers,
N-set

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