Good morning all. I found these from Gregg at Virtual Hi-Fi in Poland I believe is where he's located. His very first retail product offered at a discount to get him started. They are good looking under my Velodynes and make a big difference in my room. I'm on a slab foundation with carpet, padding, an18"x24" ceramic tile and then the subs now on these footers that screw into the OE mount points with the supplied adapters. No muss, no fuss. Working very well for me. Worth a look. Goto: < VIBRON Speaker Isolation Feet (4pcs) – Virtual HiFi https://share.google/KXseQZ31mdFaDcqgk >.
SOLVED: Room boom
I have raised wood floors and VSA Ultra 55's (active edition) with Critical Mass footers. Tracks like Boz Scaggs' Thanks To You would cause the floors to physically vibrate so much I could feel it through the frame of my listening chair even with the VSA bass gain to lowest setting.
TL;DR I added these these $30 vibration pads under the CM footers and they totally cleared the vibrations: https://a.co/d/fvC3av5. I'm also getting better general depth & clarity.