The audio store where I purchased them (The Audio Gallery, Lake Oswego, OR) advised not to put spikes under them, as well as not to use spikes with the REL. I was very happy with the sound and bass performance with the system set up in our home in OR.
When we moved from Oregon to the location for this music set up the REL and SF distributor came over and we spent the afternoon fine tuning everything. With no spikes under any of the speakers we were able to achieve excellent base response and a very wide and deep soundstage.
In our new home I know it will take some time and patience to dial everything in again.

