Even more stable but more bulky are stands made from cinder blocks.

Of course you have to cover them with exotic cloth from Thailand.
Enhancing sonic performance via stands may not be nearly as much of an issue with these - remember they are solid marble 2" thick with the baffle 1/2" thick, not a lot of vibration issues anyway.
To me, the first thing to do is figure out where they should go, and how high off the floor you want them, and at what angles on the X and Y axes. Then you can decide what the best stands are for your needs. You want to give them a foot or two clearance from the wall.
A few years back I was experimenting....
