Quatro Wood best feet


What is best isolation fee for Quatro Wood speaker other than stock spike, maybe not granite either since I have stone tile, and concrete underneath. any advise will be appreciated!

Best Regards
Zee 
zensview
You should also go to Vandersteen's website and do the 'ask Richard' pull down.  That's the best place to start since he designed them and knows the answer I promise.  
I actually did that, and RV suggested 2inch black granite with stock spike other than isolation feet. But I have stone tile floor, and concrete underneath so I though I may just need a pair good feet.