The cones should be threaded into the TT with the point facing down.
An effective CLD that can rest on top of an existing support structure can be built out of the following materials, working from top to bottom.
A layer of felt
a sheet of 24 gauge stainless steel
1" of industrial grade foam insulation
A layer of cork ( as used in a cork-board )
The felt absorbs any motor noise and damps any ringing that may be reflected from the bottom of the TT or generated from the sheet of stainless itself.
The stainless provides a solid platform for the cones to rest upon. Stainless isn't ferro-magnetic, so it won't play games with re-radiating the EM field generated by the TT motor like some cheaper metals would. You can use aluminum here, but it would have to be of a significantly heavier gauge i.e. give or take 20 gauge or so. This adds mass, which isn't what we want.
The foam acts as a "layer of loss" i.e. an energy sink for the vibrations that the cones couple and "drain" into the stainless. That same "layer of loss" also helps to isolate floor-borne vibrations from coming up into the TT.
The cork acts as another layer of loss, but in a different manner. Due to the difference in mass, density and construction, it is more effective in dissipating energy at specific frequencies and breaking up nodes.
There are multiple other ways to do this, but this approach is both cost effective and the materials are typically easy to obtain.
If you wanted to use this as a shelf itself rather than as a base on top of an existing shelf, you can add another layer of felt coated SS at the very bottom. This would provide the necessary rigidity to keep the shelf from buckling under the weight. This should be able to support most any component that you throw at it short of a heavy amplifier or very complex tube based preamp, etc... Sean
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An effective CLD that can rest on top of an existing support structure can be built out of the following materials, working from top to bottom.
A layer of felt
a sheet of 24 gauge stainless steel
1" of industrial grade foam insulation
A layer of cork ( as used in a cork-board )
The felt absorbs any motor noise and damps any ringing that may be reflected from the bottom of the TT or generated from the sheet of stainless itself.
The stainless provides a solid platform for the cones to rest upon. Stainless isn't ferro-magnetic, so it won't play games with re-radiating the EM field generated by the TT motor like some cheaper metals would. You can use aluminum here, but it would have to be of a significantly heavier gauge i.e. give or take 20 gauge or so. This adds mass, which isn't what we want.
The foam acts as a "layer of loss" i.e. an energy sink for the vibrations that the cones couple and "drain" into the stainless. That same "layer of loss" also helps to isolate floor-borne vibrations from coming up into the TT.
The cork acts as another layer of loss, but in a different manner. Due to the difference in mass, density and construction, it is more effective in dissipating energy at specific frequencies and breaking up nodes.
There are multiple other ways to do this, but this approach is both cost effective and the materials are typically easy to obtain.
If you wanted to use this as a shelf itself rather than as a base on top of an existing shelf, you can add another layer of felt coated SS at the very bottom. This would provide the necessary rigidity to keep the shelf from buckling under the weight. This should be able to support most any component that you throw at it short of a heavy amplifier or very complex tube based preamp, etc... Sean
>