Equipment Rack

theaudiotweak,

In layman's terms, what are you saying? 

Theaudiotweak wrote,

"Remember isolation can only exist in the absence of matter..if you get the drift."

Nobody ever said isolation is or has to be perfect 100% isolation. What we’re talking about is actually rather imperfect isolation, a low passive mechanical filter (for most iso devices) that is inefficient for very low frequencies but increasing effective as one goes up in frequency. You know, depending on where the resonant frequency point happens to be. Thus by the point you get up to say 20 Hz the isolation is very close to 100%. And for frequencies that really count, e.g., the resonant frequencies of tonearms, cartridges, laser assemblies, etc. Circa 10-12 Hz the effectiveness of a competent iso device is actually quite good.

Ricred1

I sent you a message thru Audiogon. 
Most any answer would most likely generate another question which would be most efficient to answer in a phone conversation.

Thanks,
Tom

Geoff’s right ya know. Isolation down to around 3Hz can be accomplished pretty cheaply via a mechanical filter. With it in place, the nature of the shelf under the filter makes far less difference. A lot of people are "tuning" their audio equipment, not isolating it.

bdp24,
Please provide me an example of a mechanical filter product that I can purchase.