What is a good base for speakers


Fussing with setting up a new system in basement. My vintage ADS L710's sit on original stands that don't have fittings for spikes. As the stands sit on a carpeted floor, they rock a lot (no pun intended). I'm thinking of some sort of base to settle them down. Looking for suggestions of a material appropriate for stability  - any experience with wood butcher block, granite or slate cutting boards as a base? More DIY than expensive. Thanks for any suggestions. 
mcondo
I use some pretty decent amp stands for my B&W 804D3 speaks. Got them from AGon member Solidwood (Timbernation). With screw in cones came to $310. Had to drill them to secure but didn't take long.
Also, you could visit a Bed-Bath-and Beyond store and look at some big cutting boards.
any experience with wood butcher block, granite or slate cutting boards as a base? More DIY than expensive.

I have experience with all of these, which is why I recommend springs. Nothing else even comes close. And I am pretty darn good at DIY
https://systems.audiogon.com/systems/8367 Yes I built the table and stand. Springs are totally the way to go.
Often concrete floors are not level, have low spots. I would buy butcher block cut to size and add spikes that can be adjusted for leveling. Maybe stands could be bolted to the butcher block.