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RE: EAR Isodamp C-1002 equiptment feet

Posted by fastcat (A) on October 25, 2020 at 09:46:59

In Reply to: RE: EAR Isodamp C-1002 equiptment feet posted by willsw on October 25, 2020 at 09:06:57:

Willsw:

In the transmissibility graph, the peak is at a lower frequency range. To some extent, where the peak frequency is at will depend on the mass that is being isolated. Typically, the higher the mass, the lower the peak frequency point. And, the magnitude of the peak frequency is also usually higher in level with increasing mass. The peak frequency range of an isolator response is an area where input vibration is AMPLIFIED (not attenuated). So the inherent damping of the C-1002 material helps to limit the amplitude of the peak frequency MORE than most isolation materials (those that do not have inherent damping). This is a desirable characteristic, because amplified vibration energy is not good. In the graph you will notice that the response drops off above the peak resonant point. The drop off area is where vibration isolation occurs, and this is what you are after in using an isolator. In an IDEAL world, a perfect isolator would have NO peak frequency - just high attenuation of the input vibration across a very wide frequency range (below 20Hz to 20 KHz).

Regarding audio electronics, having the peak frequency as low as possible (and the peak amplitude as low as possible)would be very desirable - and perhaps well below 20 Hz (not always practical or achievable, as there are always trade offs). Because every piece of audio electronics have different masses, stiffness, and internal mechanical conditions, it is hard to predict just what effect a given isolator would have (unless you were doing extensive lab work ($$$$). In general, a good isolator should generally reduce the vibration of internal electronic components, which will bring you closer to the sound that the component could produce if it were not affected by external vibration. Usually a step forward, but depending on listener sonic tastes, you may or may not like the results. There are no simple universal answers - try some good isolators and see what happens. All this is complex because of so many component variables, and so many different listener tastes in what they see as "correct" sonics.

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