Blu Tack between my suspended wood floors and my Infinity RS1b mid/high tower feet. Reasonably priced and works well.
Speaker vibration isolation
P.S. Audio has a video on YouTube, “RMAF 2018”, on Isoacoustic’s speaker vibration eliminator. The demonstration was impressive. Does anyone have experience with these, specifically the ones that replace the spikes as opposed to the stands? Thank you.