Peterayer, I had two Halcyonics unit with one under the turntable and one under the amp most of the time. I had thought to buy more Halcyonics but the price got outrageous. Really it was the StillPoints Rack that came along first. When I put everything on the SP Rack it was better than my previous sound. I longed for the possibility to have all Halcyonics but could not afford that. Ultimately the guy who bought my Shindo turntable wanted the Halcyonic unit so I sold both. The second Halcyonic went shortly thereafter.
I did try various feet between the Halcyonic and the Shindo but they did little.
I think Paul is wrong about where the greatest benefits of the SP Ultra SSs or Ultra Fives are. On my amps SP Ultra Five on SP Component stands are just outstanding. Once I got rid of the acrylic shelves on the SP Rack, the Ultra SSs and Ultra Minis are also outstanding. The SP Ultra Fives are outstanding under speakers, but four are needed, not just three. In all cases four are better than three, but you have to keep all four in contact with the component.
Most vertical vibration is turned into horizontal vibration which can nowhere and thus is converted into heat.
No my present turntable is a Bergmann Sindre with no real suspension. It is on SP Ultra Fives which are also mounted on a SP Component stand. Initially, I am just going to put the Nantais Lenco Reference where the Bergman is now. The hundred pound weight of the Reference will mean something other than the Mana Stands glass shelf.