It's snake oil, just like the fuses. There's no science around this stuff at all. It just sounds technical to those who aren't familiar with the technology. If the footers performed some kind of mechanical isolation, may they'd do something useful. Personally I don't waste much time with that silliness either. I think the money would be better spend better treating your room.
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I am very happy with these under my Thorens TD124 and Garrard 301, both of which have heavy plinths. https://www.ebay.com/itm/4-PCS-D53-H58-High-quality-Amplifier-isolation-Spike-maglev-feet-Audio-stan...
Not all good tweaks have to cost money. Generally the best don’t.
How is that?
Well, the best tweaks which are more ’intellect applied to the given scenario’ rather than ’expensive little bits of whatever’....are sought out by the manufacturers of gear themselves, as they can use such things to add value to their own production of finished product.
It’s one of the key ways of ’winning’ the retail product wars.
If one was to think that manufactures of amplifiers, DACs, source devices, speakers or whatnot don't appreciate effective tweaks, I can tell you the exact opposite is true. They seek them out with a vengeance, and work hard to discover and apply such things as this where cost vs return can really play out.
And the tweak can be anything at all, a part, a chassis design aspect, a circuit mod or change - anything at all.
Thank you fsonicsmith for your recommendation. I purchased 8 of them for my Raven AMP and Lumin X-1. Wow the difference, was incredible. I don't get it but I don't care. It was well worth the $200 and it saved me over $3k from buying the ones I was looking at. I answered my question....they are not snake oil!