Has any one else tried using thick marble slabs under their speakers?

[mgh13]

There is no wooden plinth in use, so here's the process:
Depending on if your going to spike the plinth, if you use the spikes you get to set the level on the stand, (if your not using the spikes just place the plinth with the attached pad on the floor) then while the speaker is laid on it's side, you spike the speaker, running the spikes all the way to the bass (bottom) of the speaker. Simply pick up the speaker then place it on top of the plinth, Ta Da! your done. The stand is level and the speaker is level. You can then be able to adjust toe in and back & forth placement, this won't scratch the marble. When you purchase the AIT plinths through 2nd Floor Audio. com and purchase the spike kit they drill the holes and install the inserts for free. (No easy task but really makes a difference in sound to use the double spike system) Special tools are needed to drill into marble and sometimes they break trying to get the holes so near the corner to make it easy to adjust the spikes.