What is a good base for speakers

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

One idea: (from ASC website)
(tube trap)

“If you just buy a couple of these and stick your speakers on top of them, it will completely transform the sound of your bedroom, I promise you." Pete Townshend
the Who

 And to add to this-two more above / on top of the speakers ... 

What you need is to keep the speakers from moving in the direction of what the drivers are moving, so that the drivers can push air without the cabinet fighting it. I believe the ADS are front firing drivers, which means you need to keep the cabinets to be kept still in the fore-aft direction, mainly. Of course it's better to eliminate motion in all directions. 

As for carpet below the stands, its best to increase mass at the base of the stands, and use something with spikes (below the stand) that penetrate the carpet and padding to mechanically couple the stand directly to the floor (wood or concrete). This hopefully eliminates the carpet/pad spring that otherwise allows the speaker to bounce or rock.

After that, you can consider stiffening the stands so it doesn't bend.