The Gaia I's were of great benefit to my speakers even on a cement slab floor. One note on the Gaia's is that they are directional and need to be properly oriented with the label either facing forward or backwards. Like many have already mentioned they come with a 30 day return policy, so they are well worth a try. I was prepared to send them back if they didn't provide a noticeable sonic improvement......they've never left my speakers. Lastly, I have my installed with the Sound o City outriggers which look great together and add more stability.
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.