Vibration - What are the Main Sources?


A current thread discussing the best tweaks gave consistently high ranking for component isolation. I am curious to know where all the vibration is coming from that we are addressing with isolation. I understand that high volume listening can create significant vibration, but for the sake of this discussion let's assume we are listening at moderate levels. Can the vibrations from moderate sound levels affect the quality of sound? Are there other common significant sources of vibration that we are guarding against that can dramatically affect sound?
zlone
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It's sad that a topic worth discussing gets sidelined by the same few posters. 
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BACK ON TOPIC:

This brings up the question that since literally everything vibrates,
is it plausible to posit that the higher quality the equipment, the more sensitive it is to audibly transmissive vibrations, therefore it requires more sophisticated damping than lower quality equipment where a more extreme amount of damping is not required to improve the sound as it has reached it’s improvement threshold?