will
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This is a tricky area, fraught with different approaches and ideologies.... couple, de-couple, damped, some of each. Not that it is necessarily the best, I found I morphed/evolved over time into using some of each, and the only way to really tell for a particular use is to listen to comparisons.
With my HR-1s and MG944s (also ZYGI speakers) I found decoupling with this kind of ball and aluminum setup (or similar), worked best here compared to spikes. My floor is fired red brick on top of sand, and under that earth, so a good "drain" conceptually. As I recall the spikes I had helped overall, but focussed the sound too much for me, while changing the tone and feel in a little artificial sounding ways to me.
Under the HR-1s now I have much more costly, and similar but heavier duty bearing and aluminum feet, probably a little more carefully made by Ingress Audio. Comparatively they have a heavier top and bottom and a single bearing joining the carefully machined top and bottom cups. I think they brought a natural sounding focus more-or-less across the spectrum, while allowing more of the finest detail and space, and not changing the general tone or musical delivery negatively.
Back further, I was playing with wooden cone feet, and a number of Herbie's Audio labs things, and I still have some of them in some specific places. But I have for the most part moved away from Herbies on more critical stuff. All I have tried do some good things for bringing out finer information, but to me, at least the older models I have, tend to dull/slow the sound to various degrees too, making the sound on their own a little too damped for me. This is why I tuned the Chinese feet as described earlier, to tune each use to sound most complete and natural. As far as I can tell, all materials and designs have a sonic tendency, and if they are used together on the same foot, tuning can help. I wonder... with SS if the sounds of damping softening may be an attempt to make it feel more "analog" or something... hard to say, but I always prefer feet with less obvious self-sound.
That said, I have some Herbie's (I think Big) fat dots under my heavy Teak equipment cabinet, and the fat dots helped with fine detail, the good outweighing the level of damping sound effects they imparted for me, but there was enough that I believe I have compensated for dulling elsewhere. I have wanted to try something else there, but the cab is so big and heavy, I have just left it alone... these feet being pretty good... and of course it would seem that what we put on a foot effects their sound too, and this dude is heavy!
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