IMHO neither. Both will transmit vibrations in both directions - I would opt for some isolation materiels which would reduce or eliminate the transmission of vibrations, especially if you referring to tube amps.
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Definitely not granite, it stores energy and it rings. I plan to use maple butcher block on Walker Audio Valid Points with my tube amps (100lb monoblocks) based on what I've heard in other people's systems.
Alternatively, many people report great success with platforms that will not store energy such as Neuance shelves from Greater Ranges or Sistrum platforms from Star Sound Technologies. There are others.
Or you could just cut yourself an appropriate sized piece of 3/4 inch MDF which you can get down at home depot. Cover that with the sound damping vinyl sheets you can order from Parts Express and for a whopping investment of about $40 you can achieve what otherwise might cost you hundreds, even thousands for the voodoo audiophile solutions.
Here is what I did guys.I bought the required material from a company that specializes in metals.A.S.A Alloys. They sell
stainless steel,nickel,aluminum.They deal with big orders though.I used 1/2" thick aluminum angle line sized @ 4"x6".
I cut four lenghts @ 30,1/4" long.I braced each set together with 2"x4" aluminum tubing.I drilled and tapped two 1/2" holes under each angle's 4" side.Thats where the 1/2"threaded feet are going.The final product looks massive and very impressive.So I made two amp stands with overall size 20,1/2"wide by 30,1/4" deep.Height including the stainless feet is 7,1/2".
Top platforms will be made out of maple and will be resting on the aluminum stands on brass cones.All my connections are with stainless steel screws to keep it non-magnetic and the tubing could be filled with sand or lead.Allthough that would make them very-very heavy.They are HEAVY now even though empty.
You went to a lot of trouble for this "amplifier platform" only to screw up the sound by placing it all on top of a high mass entertainment center. And when you factor in the havoc that is being wreaked on the rest of your components with this behemoth, you can imagine what the end result is. Do yourself a favor and buy a decent equipment stand before you go playing around any more with isolation devices.
I agree with Oz. I had my CD transport and D/A on an entertainment unit, and was amazed when I tried them on my wall-mounted turntable stand; the sound was much cleaner, and with more detail all through the spectrum. Out went the entertainment unit; I bought some Atlantis Symphony 1 stands, replacing the supplied MDF shelf (sounds horrible) with plywood. Unfortunately Atlantis no longer make that stand; instead they make something with an integral MDF shelf.