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Old 22nd January 2007, 07:51 AM   #1
Tee-Rex is offline Tee-Rex  Israel
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Default Turntable stand

Hi,

I'm building a rack to place my TT on. Generally it's a wood made stand with 4 feet filled with stand, and a shelf on top of them (simple, huh?). However, on the shelf on I will place 4 ceraballs (from Finite Element) which I already have and then on top of that a platform for placing the TT on.

For this platform, I've been working on designing a Symposium clone (like their super plus platform: http://www.symposiumusa.com/platforms.html). The general idea is a layer of rigid, closed cell foam in the middle, an then going outwards several layers of materials, the outermost being aluminum. The idea is each layer is not to far in terms of acoustical impedance from the adjacent layer, so that vibrations flow easily from the outer layers (the top on which the TT stand and the bottom that faces vibrations from the ground) inwards to the lossy foam layer, where they should dissipate.

What worries me is that although the foam is non-resilient, it still has some compliance to it, and I'm afraid it will "kill" the sound.

So before I make any stupid steps - does anyone have experience with placing such a platform under a turntable? Maybe better ideas?

Thanks much,
-T
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Old 22nd January 2007, 02:54 PM   #2
hacknet is offline hacknet  Singapore
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looks pretty cool huh..

i've been mucking around with plinth resonance lately and i've learnt my lesson that the traditional concept of dead is good doesnt always apply.

i had to seperate my mdf layers with rubber and double sided tape to get any life out of my table.

i think it might be a good idea to try diying the symposium system. i would like to try it, maybe with neoprene or something common because i cant really find closed cell foam over here.
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Old 22nd January 2007, 04:19 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

good design depends on the type of turntable and type of floor.....

/sreten.
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Old 22nd January 2007, 04:37 PM   #4
Tee-Rex is offline Tee-Rex  Israel
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Thanks Sreten, you're right!

The floor is pretty stable concrete. Jumping near my old Kenwood kd600 placed on a light weight Finite Element Spider rack hardly causes mistracking.

The intended TT is an Amazon Model 1. It's not a suspended design, but it is a dual plinth "sandwitch" design constructed of 2 acrylic plates with 8 sorbothane pucks between them, so it also isn't 100% mass damping as well.

Platter weight is 5kg and total table (including seperate motor unit is 25kg.

Cheers
-T
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Old 22nd January 2007, 04:49 PM   #5
Tee-Rex is offline Tee-Rex  Israel
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And while you ponder about it
Here is the idea of the design

The Ceraballs will be placed on Auminum elements that will enable to level the whole thing.
Attached Images
File Type: jpg rack-tt-v1.jpg (20.5 KB, 393 views)
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Old 22nd January 2007, 04:51 PM   #6
Tee-Rex is offline Tee-Rex  Israel
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And this is how it should look on the outside
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File Type: jpg rack-tt-v1.jpg (12.0 KB, 337 views)
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Old 23rd January 2007, 05:01 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

FWIW I'd go for a massive virtual earth slab mounted on squash balls.
I wouldn't go a for a lightwweight slab rigidly mounted unless the table
in question had a full sprung suspension.

/sreten.
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Old 23rd January 2007, 06:28 PM   #8
Tee-Rex is offline Tee-Rex  Israel
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So, Sreten would you say that in my design the inner foam layer would act the same as your squash balls, and if I make the outer layers massive and heavy, it would have the overall same effect?

Cheers
-T
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Old 24th January 2007, 10:38 AM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Tee-Rex


So, Sreten would you say that in my design the inner foam layer
would act the same as your squash balls, and if I make the outer
layers massive and heavy, it would have the overall same effect?

Cheers
-T

Hi,

I would not say that. I've looked at the design of your turntable and
what I'd use is a massive solid slab (e.g. slate) on 6 squash balls.

/sreten.
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