Isolation Devices

Thanks for your email and clarification of the answers I was looking for.

Sam

Most people, when asking a question, don’t understand the nature of the question. To compound the nightmare, most people are not trained to properly frame or put together a question. They just don't have the disciple and rarely encounter a need for it.

If a question is properly fleshed out, it generally begets the answer. No need to post a question as a thread.

The two are a matched pair, a set of bookends. Question = Answer.

the OP was not properly fleshed out, so no one could, relatively speaking, provide and answer that was any better.

and you end up with a thread, where people walk past and talk past one another...

Which is, again... invariably the essence of audio threads.

("Why does the sun shine? Are Stars just pinholes in the curtain of night?")

I tend to agree with the responses you received from @cd318 and @squeak_king_77 .  As examples, the widely used  Equipment Vibration Protectors (EVPs) are offered with either rubber or felt backing on the top or bottom - with no discussion about any change in sonics or performance.  Also, Sound Anchor's Conecoaster spike support discs come with a felt-like material on the bottom and I was able to successfully slide my large speakers around on hardwood floors when I used those.
Of course, as usual, @millercarbon provided the most reasonable response!

@samgar2 - millercarbon has always stated to trust your ears, his response was VERY SARCASTIC.

By the way what material is the substrate under your floor?
Peer and beam wood, or concrete with parquetry, and yes this makes more of a difference, and yes I can explain why.