Isolation Theory Question


I'm comparing the Vibrapod versus the Cardas/Ayre myrtle block devices for isolation in my system. My stands are Lovan Soverign with small pieces of sorbothane between the steel frame and the wooden shelves as a bit of an after-market tweak. I have not mass loaded the stands.

My question is more theoretical, as there seems to be a difference between these options, but I cannot say if one is better than the other, they are just different. So, I feel that it's pretty obvious what the vibrapods seek to accomplish, but am unsure what problem the myrtle blocks are supposed solve? It seems to me that any vibration will be transfered from the shelf to the component through the block. Is this not the case?

Right now, I seem to prefer the blocks under my solid-state amp and tube preamp and the vibrapods under my dac, transport and turntable... I'm not sure what to infer from this, but it seems that the devices that have motors prefer the vibrapods and the more stationary devices prefer the blocks. I'm curious if there is any "theory" that might help me decide what to use where?

Thanks!
-Marc
mre2007

Showing 3 responses by bright_star_audio

Hi Mre2007,

Anytime you have a rigid device under a component any vibration trying to enter from underneath has a direct path into the component's chassis. That includes points, blocks or slabs of rigid material. The material from which the device is constructed (as well as its size and shape) will determine the resonance modes of the device - the material will store and then release vibration energy over time. Wood has significant resonances. That is why it is selected as a material from which to construct many musical instruments since each invidual instrument SHOULD have its own particular signature or voice. An audio system (or a component) that reproduces the sound of many different instruments that have been captured in many different recordings SHOULD NOT have a particular signature or coloration or it will impart that distortion on to EVERY recording that it reproduces.

Sometimes the introduction of a device or material into a system that colors (alters) the signal that has been captured in the recording will sound "better" to an individual than how the system sounded before the device was introduced. This may be because the device is adding some kind of complementary coloration to the system. In actuality, the system had a problem (or multiple problems) and afterwards the problem was less apparent or it has hyped up other areas that are exciting to the listener. The individual should be aware that the problem has not been eliminated and that now there is a new set of problems that have been introduced by the device and that system is not necessarily closer to accurately reproducing the sound of the original instrument as it has been captured in the recording.

Some may say "I like it so that's what's important". I believe that it is important to like the sound of one's system but without using the truthful sound of live, unamplified instruments as the reference people assembling audio systems are in the "wild west" and pretty much anything is legitimate as long as they like it. We might as well add lots of equalizers to our systems or have Bose Waveradios if faithfulness to the source is not of particular importance.

Mre2007, please note that my comments are of a general nature and are not necessarily a criticism of your particular system.

Best Regards,

Barry

Barry Kohan
President
Bright Star Audio

Disclaimer: I am a manufacturer of vibration control devices (I have been asked by Audiogon to make this disclaimer when I comment on vibration control).
Hi Dbld,

Thank you for your question.

Rigidly affixing the component to the rack will allow any vibration within the rack (sourced from the floor or from the rack's structure vibrating in sympathy with air-borne vibration) to have a more efficient path INTO the component. That would increase the amount of vibration that is contaminating the signal flowing through the component.

A properly designed vibration control set up would also address internally-generated vibration (from spinning motors, humming transformers and cooling fans) besides just addressing floor-borne and air-borne vibration.

Best,

Barry
Hi Dave,

My company does not manufacture, nor do we recommend, pointed cones for use as vibration control devices. I think you may have us confused with another company.

Best,

Barry