Isolation Devices

Felt would change the perceived sonic outcome of the use of the given isolation device.

If the change is enough to alter the characteristics enough for the individual involved, or not? That is the question.

All one can do is try. Try one, try the other and then try both at the same time, listening to the differences between the three states.

After the given switch is made, wait a few weeks or days and make a swap or change.

Our ear-brain, like our eyes, builds up the image over time. In this case, it is a sonic image, built up, over time.

Which is why a-b switching in audio is just plain wrong. It’s about the cumulative effect on subtleties, it’s not about the gross levels of anything.

Subtleties, all subtleties. And that takes time to realize. Exactly like that of intelligence, exactly akin to it neurologically, it’s a difference and time thing. Speed, rate, and breadth of cognition, as a differential between individuals.

Some can hear it in seconds, some can hear it only in days or weeks. Some can’t understand it at all. And probably never will.

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!