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Isolation Questions

Hi to all,

Being a true believer in vibration control, I purchased a BDR Shelf for Source here on Audiogon (thanks Sam) for an AA Capitole mk 11 CDP, equipped with BDR cones affixed to the bottom of the chassis.

My very limited understanding of the principles involved seem to indicate that the CDP, when placed on this shelf, will likely be more resonant than the shelf. Subsequently, shouldn't the point end of the BDR cones be in contact with the chassis of the CDP? If that's the case, reversal of the cones won't be an option, but I think rollerblocks might be more helpful in draining internal CDP vibrations. Any thoughts on that?
If the consensus is that the cones are fine where they are, can anyone advocate for rollerblocks under the BDR shelf, or is that like killing a mosquito with a shotgun?

Thanks,
brimac
plato
1,543 posts
 
Stehno, just what are "appropriate points and racking systems," in your experience?

My experience tells me that those variables would vary for every different component available due to the fact that the resonant nodes would vary from component to component...
stehno
1,453 posts
 
Plato, before I consider a response to your question, I'd like to ask; why do you wish to know?

I ask because you stated above that based on your experience nobody can provide a definitive answer to Brimac's question. Therefore, I would think that my answer to your question would be of no use to you.

-IMO
theaudiotweak
2,801 posts
 
One correct answer. Collage is not the one.
ash2459a276
22 posts
 
Brimac,

If my memory serves, you are supposed to put the flat side of the BDR cone on the Shelf. Can't you have your dealer open the Capitole and unscrew the BDR cones?

Alan Hsu
viggen
838 posts
 
The answer is yes, I think. Vibration drains in the direction of the pointed end of the cone, I think. So, the way the BDR is fixed to the CDP should be correct.

And, having the pointed end touching the CDP might have more isolation benefits, but, the, in this application, it probably has more mechanical vibration influence over the CDP by changing the resonance of the CDP rather than draining or isolation.

Rollerblocks under the shelf is hard to say. There definitely is benefit from isolating the Shelf, but whether you can hear the benefit varies between systems just like anything else.
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