I use 16x16 inch granite tiles, available at tile stores. I keep the finished (shiny) side to the floor for easy sliding when I want to adjust the speaker position. I've used original Aurios in this manner under many sets of speakers up to 100 lbs over the years, always with excellent results. Sonically preferable to spikes, I believe. You can also experiment by "sandwiching" other materials over the granite tiles, or between the Aurios and the speakers themselves. I've used wood, cardboard, rubber. As usual in hi fi, everything makes a difference, sometimes a difference I like.
