More isolation. It seems to me you’re using spikes, devices meant to concentrate the load and give it direct contact and then nullifying those effects by adding distribution and then isolation.
The main thing is I didn't want to spike directly into the floor for fear of my wife's wrath, plus I also didn't want to damage newly sanded and varnished flooring when we bought our home. I tried using the metal coaster floor protectors like in post #31 but I found that setup to be somewhat unstable, someone would walk near the speaker and the slightest touch would start the speaker on a tilt.Maybe you're right, it sounds so good I should just dismantle the whole setup.
Just kidding of course, but it does sound sublime. You should come check it out.
So, I started to experiment. I tried no spikes, didn't like the sound (muddy and lost). So spikes were a necessity. The only solution I thought about was to create a wooden platform for the spikes, bought some solid wood used for stair steps and created what I show above. Initially, I didn't have any felts below the platforms, its sounded ok but it was a bit all over the place in terms of bass so I figured the vibrations from the music being played are having a negative effect on the the sound, maybe working their way back to the drivers.
I then thought to isolate these wooden platforms. I tried rubber, didn't like it. The sound just died, sounded like it was behind a curtain. I tried gel pads, cork pads, mehhh. Finally, I tried four small felt pads right below the spikes. The bass came back, everything became more defined, the speakers seemed to breathe again.
It works for me, given my setup and room acoustics. It sounds just great and I get to save my floor and have a happy wife.
Maybe I discovered "coupling by isolation".
Cheers, sir.