Brass footers for speakers

What effect does a concrete floor underneath the carpet have on the damping as opposed to a wooden floor?

Your footsteps would probably not make a concrete slab vibrate but probably would make a wooden floor supported by wooden joists vibrate.

Mapleshade would be another option.

Good luck.

Coupling your speakers not only improves the bass but you'll hear a marked improvement in detail and definition.

I went a step further and replaced the four spikes with three heavy cones solidly mounted to a custom built platform. Cheap and affective.

The other POV is that "coupling" to the floor material allows sound to be conducted through the floor material to the listener, and that sound will have a different arrival time than sound conducted through air. Although concrete is less resonant than wood, it still will conduct sound.

This POV holds that "decoupling" or isolating is the way to go. Many proponents, including Genesis and NOLA speakers (the better models all have built-in decoupling), Barry Diamant, manufacturers like Stillpoints, Symposium (Rollerblocks), etc.