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
For solid bass you need a solid base. I base this on solid experience. You may find it baseless. 
Funny russ69..  btw - re: the 3 point solution I have run YBA gear for a long time and they have 3 point feet. How could I have forgotten that!
IMy listening room's in my basement and I bought a pair of usher be20dmd's. These speakers weigh 200 lbs ea and the iron plinths that screw into them with 10 3'' metal screws weigh 85 lbs each so 285 per speaker
 The dude that sold em attached coasters to the plinths so they could be slid on carpet, they looked like 4'' vinyl tiles. I peeled the tiles off and put the supplied spikes on and bass improved tenfold, in fact I doubt he would have sold them had he listened with spikes attached. Did raising the speakers 1'' off the floor tighten up the bass or was it decoupling the speakers by installing the spikes? I know it wasn't the weight. Yes the ushers used 3 spikes per side, as does my hegel and meridians.
I bought two of these cutting boards, marked and drilled 5/16 holes at the four corners inside of the drip rail.  Screw in threaded inserts and then the cone points.  Flip over and the bottom surface is now the top and is completely smooth edge to edge.  Set them in living room with a level on top of them, adjusted until dead level and tightened the locking jam collars.  No matter what speakers I put on top, floorstander or stand mount, spiked or decoupled, they have a plenty large enough base to work from and always level.  I needed to compensate for an un-level subfloor as well as gain a few inches in height because of my listening chair.  Roughly $100 all in, look pretty decent and perform well for the investment.


https://www.ikea.com/us/en/p/aptitlig-butcher-block-bamboo-00233429/

https://www.parts-express.com/Dayton-Audio-DSS5-BK-Black-Spike-Set-4-Pcs.-240-684