Is Spiking Necesarry?

Herbies big fat dots under Thiels on hardwood floor over concrete has been best in my system.  Spikes the worst.

What is the general consensus if any, on speakers sitting on hardwood floor in room above basement. I guess this is called hanging floor but I'm not sure. What about some kind of a damping material between the speakers and the floor?

Kalai--helped a friend use those footers SVS makes for its subs on a set of DefTech towers (can't remember which model, but with a built-in sub) on wood floors over a basement.  seemed to do better than some homemade platform/plinth thing he had.  for pretty cheap and a little elbow grease.  noticeably, but not drastically, reduced some vibration.  he thought it actually helped the bass.  I couldn't really tell.

Kalai, If your basement ceiling is not finished, you could also reinforce it under your system to make the floor more robust in that area. Just a thought. 

Moving my speakers (Vandersteen Treo CTs) on their built-in spikes is difficult-to-dangerous by myself. I cut four pieces of 2 x 2 a bit longer than the speakers are wide , then slipped one under the front and one under the back of each speaker, as "skids." This lifts the spikes just clear of the floor and makes moving them quite a bit easier.