Italian, thanks for sharing your experience.
Slaw, I've asked a few questions here. Bear with me. I'm uncertain which one are you referring to as misguided.
Bdp24. I looked at the Townsend pods you recommended and will track down the Youtube video.
Right now, what I need to find is basic. I will have metal clips holding up the shelves. The clips will be on standard vertical tracks, commonly used for adjustable height book or cabinet shelves. I'm sure you've seen them. The flat portion of each clip the shelves will sit on is approximately 3/4" x 1/2". I want to find some vibration absorbent material to sit on the clips between them and the shelves. I was thinking maybe 3/4" by 1/2" pieces of sorbothane. But, since you mentioned sorbothane doesn't isolate to low enough frequencies there must be something else to use, maybe silicone as suggested above.
In the interest of full disclosure, the top shelf to hold the turntable is already in place. It was built years ago to hold one of those old fashioned enormous wide screen televisions we were stuck with before flat screens came out. I am building the rest of the shelves for the amp, preamp etc underneath that pre-existing shelf. I will be placing my marble slab on that pre-existing shelf with a shelf liner under it, as suggested by Williwonka above to help defeat vibration and resonances. I wonder if bdp's suggested constrained liner damping might work for this as well under the marble.
I will later find feet for each component that hopefully defeat any remaining resonances or vibration. Any suggestions on what material might be advantageous to sit between the metal clips and the shelves would be helpful
Kingrex, I wish I could afford something like an electron microscope stand. But I'm hopefully purchasing some exorbitant for me, $10,000 speakers next week, so I have to not bankrupt myself otherwise. If my late wife was still in the land of the living, I guarantee you I would be doing none of this. I can hear her in my head saying "What do you mean you need an electron microscope table, what do they cost?"
Tweak, sorry the train is so close to your home. I'll look up the Machina Dynamica Springs. They sound interesting.
Thanks again all.
Mike