I followed the link in Ajax's post (Hi There!) and found more information about speaker spikes...
http://oregondv.com/spikes.htm

To briefly sum up, keeps the speakers stationary and isolates them from the floor. "Put your music in the air, not the floor."

Enjoy!
BethR - Plano (Dallas) TX

BethR - El Dorado Hills, CA
To thine own self be true.