Wood blocks underneath components?? snake oil?

There are so called "magnetic isolation" tables but that is also bunk. Think of two boards, one above the other with opposing magnets on the corners. Without some type of mechanical connection to contain the sides of the top board, it will shoot off to the side. Also, it's not floating on air like a magic carpet, the magnet below is pushing up just like if the board on top was sitting on some type of foot holding it up. If the magnet below is vibrating that will be passed to the one above.

Remember Newton's first law? The thing is if anything is vibrating, it doesn't matter what it is also vibrating, either parts of itself or whatever it is in contact with. Even at zero G, the vibrating thing is going to vibrate the enclosure it is contained in and the interconnects connecting it to the rest of the system.

The answer is to select quiet, well-designed components that don't vibrate so much in the first place.

Newbee, I agree. I should've been more clear, how about this:

pumice stone

This is porous like miniature concrete blocks.

Rotarius, your explanation makes sense. However in the case of a CDP, the CDP itself has vibrations so you're not just trying to isolate from floorborne vibrations, you're also trying to get rid of vibrations in the CDP itself. Will an isolator/damper like an air bladder be effective when both conponents (shelf and CDP) are vibrating? I don't know.
For some reason something like porous ceramic which is "infinitely" light, "infinitely" rigid, and has "no" resonant mode has some intuitive logic that makes sense to me when used as an interface between two resonant components.
Sorbothane made the bass muddy and slow. Music was less clear. Maybe it's the horizontal motion thing. Using the design calculations from Sorbothane's website, the sorbothane have to be nearly 3/4" thick for optimal isolation/dampening.

Cdc - ".....you're trying to get rid of vibrations in the CDP itself."

Couple of things to think about 1)even if you could couple the CDP AND provide a path for vibrations to pass from the CDP (drain, if you please) wouldn't the vibrations created by the CDP itself already have done its damage? Now, assuming that you would argue that the vibrations would build up at the resonance point involved in CDP, and that to provide a 'drain' you would reduce the damage caused by the resonance, wouldn't you then have to have a materiel which will allow the resonance to pass thru it or allow the resonance to disappate within it by changing the nergy of the vibrations to heat?.

Fow example think of the soft rubbery products. It is established that vibrations are reduced/eliminated by materiels that absorb them/i.e changing the energy to heat. If the materiel you use is not resonant at any frequency (and such materiel does not exist BTW, even pumice stone has a resonance point) then how would it ever absorb the energy by changing it to heat.

You say that sorbothane made the bass muddy and slow - perhaps, just perhaps, what you are hearing is the absence of the effect of undampened vibrations in the CDP, but you happen to enjoy (without knowing it) the minor ringing effect thay may be creating.

Just something to think about.........

Oh, for reference, in case you didn't figure it out, I'm in the absorbtion camp and think the 'drain' theories have more commercial benefit than sonic benefit.