@steakster - wow- you know a hell of a lot more than me about Symposium. My thoughts with my speakers on Segues are two fold- 1) they get rid of/drain internal speaker noise while providing some isolation, and 2, I did not want my speakers being unstable in any way as they are tall and thin. I don’t want them to float like my components do. Peter had to custom size my Segues to have about 2-21/2 “ around the bottom to add stability.
Not sure what you mean by air borne vibrations. The internal vibrations of components are drained by roller blocks or platforms as are external vibrations from the floor.
@vinylshadow- glad to hear you will check with Peter at Symposium. IMHO though, the turntable isolation should be addressed first, but as MC says, it’s and and and and and......you can never correct noise emanating from the source. That noise just gets magnified down the chain.