Was so impressed by the Hal-O tube dampers I placed on the 12au7s in my pre, thought I'd try some Herbie's magic on my speakers.
I have Onyx Reference 3s @ 105lbs ea. in a room with a sunken floor, it's springy.
It's gotten better by placing my Denon 51f tt on vibrapods, in a Cambre rack wich I swapped out stock feet for Adona Large Brass Gold Cones.
Think next I need to decouple the speakers, but still looking for the sweet spot, so they get moved a lot.
The room has Berber carpeting.