Thiel 3.6 and 'grounding' / insulating


I have a lovely old house with hardwood floors. I just bought a pair of Thiel 3.6. I plan to use the stabilizing pins / spikes provided with the speakers (probably put the spikes on quarters or something). My question: would it be worth my while buying a pair of thick (2 inches or so) granite slabs to put under the speakers with the spikes? Has anyone tried this and if so, what were the results? Thanks.
pvanosta
Thank you all for your input.
I'll be receiving the Thiel 3.6's this Friday...no sleep for me this weekend .
The 3.6's will also benefit by the extra couple of inches elevation the granite slabs will provide. The optimum listening position seems to be (for me) near the midrange driver. Most chairs (mine included) are a little too high although a little extra distance between you and the 3.6's will help. I would plan on at least 10 feet between you and the 3.6's. Also,placement away from the back walls helps avoid any midbass emphasis - although I don't have too much problem with one of mine placed near a back wall.

Good luck and experiment lots with positioning - not easy with these big lugs....

Rich
So far, I have put the Thiels on the spikes provided by the manufacturer, and put the spikes on quarters. The speakers are well clear of back and side walls (3 or 4 feet from the back wall and 3 or 4 feet from the sidewalls). They are about 6 feet apart, slightly toed-in and 10 feet from the listening position.
The bass has tightened a bit, but I could do with a bit more. I'm looking for a supplier in my area, who will cut me a couple of stone/granite/marble slabs to my specs, so I can play with that.
Any speaker cable recommendations anyone? I'm currently using thick, multi-strand solid core Audioquest cable, with spade lugs added by the dealer.
Pvanosta I know your money will drasticaly be better spent on Audionpoints or better yet Sistrum Platforms. These devices will allow the cabinet resonance to leave the cabinet and shunt to ground. Placing the speakers on stone or marble is not going to dissipate the cabinet noise, it will only move it to a different frequency range. When cabinet noise is drained away you will hear a much more focused soundstage and one that is larger and quieter. Bass will become more extended with more weight,all the while being more tunefull. I have friends with Thiels, B+W's and Paradigm all were blown away by the improvement they heard by adding these devices. I have been using Sistrum Platforms under my Dunlavy's for 3+years now and would not bother to listen with out them.
Thank you. I will look into Audiopoints and Sistrum Platforms. I appreciate your input.