Granit amp stands are they killing my sound?

From my experience, the worst material is glass. Followed from such stones. You can find a lot of different designs, wood, wood filled with Sand or lead, Plastic (ok, it has a different name which allows to get a higher pricing)...some years ago I tried more or less by accident a Vibraplane below my amp (I used it normally below my turntable) and I closed that chapter immediately. What is made for electron microscopes is ok for High End :-)

Hello Peter,
what I heard in the very first second was a different sound staging. More like a view into a Hall, very clean details and a pure tone.
Not a change in tonality you can read from users when they try different stands, hard to describe, my first reaction was "Huh???" (I was not really expecting that, I thought, ok, the usual little bit from this here and there...) but it is amazing when you listen to records with a deep soundstage (London from 1960 for example)...or Adele, Live at The Royal Albert Hall :-)

Hi Peter,
the first experience was done with ML2.1, later with M1.2R

Have you tried putting your Galibier up on spikes or
cones on top of the aluminum sheets?

Well, that is the difference between High End and Science. When I go into a Lab
and tell a technician he should use cones below his equipment, he will throw
me out in..well..let's say...30s.
Maximum.
In High End the result is the other way..Cones??? Great idea!!!! They have
different sound? Super! There are cheap ones and expensive ones out there?
GREAT! A piece of paper below them can make all the difference??? WOW, I have
to buy that paper.... Made in a cave in Mongolia for 1250,--$ / square foot?
Deal!
... and so on