I’m an authorized dealer for both Isoacoustics and Synergistic Research and appreciate them both. Isoacoustics definitely addresses resonance but makes the sound a bit more “dead”. You can also look into Synergistic Research MiG 3.0 footers, which can handle almost any load. They do an excellent job with resonance control and are a bit more sprightly and lively sounding. Sonics are also tunable based on the direction they are oriented.
GAIAs for amp?
Since my 185lbs hybrid integrated is too heavy for even five OREA Bordeaux or IsoPuck 76s, IsoAcoustics suggested using GAIAs for the amp. Finding no info on GAIAs other than for speakers (I use them for my Tannoys). Any thoughts?