Marble or Granite shelfs in a hifi rack?

I just put in the Lack shelf I got at Ikea. Two 4" dia. brass discs are under the CDP and one brass disc on top. The Lack shelf is supported but 6 tiny brass spikes which have "o-ring" under them. The 6 tiny spikes then fit into the shelf holes of my Sound Organisation rack. The o-rings space the spikes from the steel shelf frame.

Trying to find small differences irritate me (at least tonight) but my initial impressions are:
- Lower frequencies are more articulate.
- Hall ambience is more audible.
- There are some strange and very unmusical resonances. Meaning some instruments have strange harmonics that aren't at all natural.

So does not seem to be a clear win-win situation. Maple sounds like a good idea. I think the goal is for NATURAL resonances - if you're going to have any.

Ulf, Neaunce is some type of composite shelf that absorbs vibration from floor and the component. If you dfo a search there was a long thread a month or two ago.

Excellent post Redkiwi. Non-resonant material is critical, I think. Maybe more important than absorbing vibrations.

Resonance is the natural frequency of a material. I'm thinking when music hits this frequency it will sound very unnatural. Or worse, this resonant frequency could be in the music all the time making strange tonality etc.
Resonances are much greater in intensity than vibrations coming through the floor etc. which are not at the resonant frequency of the base / component / etc.. So I'm thinking this is the first problem that needs to be fixed. Isolation is secondary.

While air bladders and sorbothane may absorb vibrations they are not a rigid mounting base and I'm guessing could create resonances or bad vibrations at some other frequency.

Noting Redkiwi's caution with Maple, maple seems pretty non-resonant and it is hard (compared to rubber or air bladders). So my next experiment will be setting the CDP directly onto 2) 2-3" wide x 1- 1 1/2" thick hardwood like maple.

Why bother with footers which just cost money and could add resonances of their own? I think direct coupling the CDP to the wood would be better. Large contact area / direct transfer. Also mass load the CDP with brass on top or brass sitting on wood sitting on CDP.

Also Redkiwi's post seems to say the ceramic foot polishing stones in the beauty section of Wal-Mart are the perfect footer solution.