I was once a big advocate of spiking about everything, speakers included. Now the only place spikes are used is under my equipment rack, but the components on the rack are "decoupled" using various footers. In my experience, spiking speakers or speaker stands to a concrete floor does create a lively presentation, but on the down side, there is an added brightness and a lack of natural warmth. Eventually fatigue sets in.(at least for me) Bottom line, decoupling of some ilk has to be added to the equation. In addition and from an experience years ago, directly spiking a floor standing speaker to a suspended wood floor was a sonic disaster. I quickly went back to decoupling devices. Now most of what I said above applies to standard box type speakers, but when I had Spatial's, I preferred to decouple them from the floor as well. YMMV, but that's been my experience.