Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: Vibration Control.

Posted by David Aiken (A) on April 18, 2010 at 23:48:09

In Reply to: Vibration Control. posted by kirillzolotov on April 18, 2010 at 17:41:06:

As suggested, "Bad Vibes" is an extremely good article.

For my part I think that 2 important issues your suggestion ignores are the following:

1) vibration in equipment can get transferred to the signal chain as noise, either because the electronics are microphonic to some degree or simply because, in the case of a transducer like a phono cartridge, any vibration picked up by the stylus is converted to sound because the cartridge doesn't distinguish between vibration due to the groove and vibration due to the movement of the LP because of vibration transferred to the platter.

2) digital players use a motorised assembly for laser tracking and vibration introduced to the disc will result in minute adjustments by the laser assembly as it tracks. Those adjustments require an additional power draw and variations in the power being drawn by the transport mechanism may impact on power supply to the decoding/DAC/analog stages of the player which may in turn impact on their performance.

When it comes to competing strategies for vibration control, then I really suggest that you read "Bad Vibes" because not all means of controlling vibration rely on isolation. Coupling can also be beneficial in some cases and approaches using minimal point contact work via coupling rather than isolation. It's worth noting that coupling can't transfer more vibration from one thing to another than is present in the first layer. When spring systems are used for isolation, vibration at frequencies below 1.4 times the resonant frequency of the spring will actually be magnified in the transfer so effective isolation will only occur above a frequency determined by the properties of the spring and below that frequency things can actually be made worse.




David Aiken

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