Hi BruceYes as per Steve's post above --I asked the question of Joe a couple of months back re the possibility of the Footers functioning under my SFG Homages which also have the Granite based stands.
He would not recommend the footers in my case.
I think the website described a damping material added to the base of your loudspeakers. This had me concerned. Please correct me if I am misremembering.......