Unfortunately this thread was full of certain peoples nonsense hence I hesitated to put a link, even though I restricted myself to the technical discussion - are you still happy for me to post the link? I am worried it might start a problem for which I will get the blame...

SM motor noise breakthrough isnt a problem. No the relation is important for suspended decks too! ANY speed irregularity is a problem - as is any resonance given the scale of features that a stylus is trying to read. Proper external isolation is way more effective than suspension - else SEMS would be suspended!