I think you want a rigid transfer of energy all the way to the floor, ideally no give anywhere.
If you can rigidly bolt those to the stand or use spikes and pads, do that. Use spikes on the bottom of your stands always. Always level the stands and insure there’s no rocking or give in the floor. This will give you the best imaging and make them disappear. Save the sorbothane for your TT.
I use blue tac because of kids, pets, others...
Never had an accident and it’s plenty rigid. Just be careful dismounting... lay the assembly over and let the speaker weight decouple it, don’t force it, especially after sitting for years.
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Is there an accepted practice with speakers as to whether isolation from the floor or rigid coupling to the floor is better? I recently replaced my turntable feet with isoAcoustics Giaia feet. They were much cheaper than replacement VPI feet. They do a great job there but were designed as speaker feet.
I use Blue Tack to mask annoying LEDs on the fronts of components. I'd really like to get it in black, but I'm having trouble shopping for it because "Blue Tack" is a brand name and it's not obvious what the generic name for it is. I've managed to find some in white but not yet black. Any advice anyone please?
I think the generic name is "mounting putty", even though it's actually a synthetic rubber. I vaguely remember a non-Bostik brand (Uhu, maybe?) having something similar in black.