speaker/stand, couple or isolate?

Thanks. I agree that applies to the speaker and the stand as a unit but I'm asking about the interface between the speaker and the stand. I know some folks use some material like blue tac to "couple" the speaker to the stand but I suspect that's mostly used to reduce the likelihood of accidental tip over. I'll experiment with blue tac as well as some soft vibration absorbing pads and see if I hear a difference.

I can only summit my personal experience and final results as I stumbled into my best setup. My speakers are Wilson Audio Sophias (160#) , my flooring is a floating wood floor on a concrete slab. After spending 6 months with the setup I was looking for a means to easily slid the speakers while adjusting the placement of the speakers in the room and purchased a set of the Herbies Gliders to assist me, spent the next couple of weeks fine tuning till I found the sweet spot, after spending a few weeks in the final position I removed the Herbies and spiked directly to floor and noticed quickly that the results were better with the Herbies at which time I reinstalled the Herbies and that was 6 years ago. About a year ago we were having new floors installed so a few weeks prior I cut spots out of the flooring and spiked directly to slab, the results were good but better with the Herbies in place. YMMV. Enjoy the music.

We now have a proper way to isolate speakers, I.e., mass-on-spring. Isolating them kills many birds with one stone. It prevents mechanical feedback. It isolates the speaker and internal wiring and crossover from seismic type vibration. It reduces unwanted speaker cabinet resonance. Problem solved! 🤗 You can forget about everything else.

Upon my original reading of the OP I neglected the speaker/stand aspect, sorry about that but feel my post may still be relevant to others.