Suteetat, my only experience has been with the Halcyonics active isolation bases. I thought they had to be the maximum benefit isolation devices. I had two of these and used one under the turntable and one under my stereo amp. A StillPoints Component stand under both was their equal. I also got a SP Rack for under other components replacing my many and multiple level Mana stands. It was far superior.
Later I added SP Ultra SSs for under the speakers. They were dramatically better than the Townshend speaker cradles. I got some more for under the amp that was already on the SP Component stand. I was shocked. I tried them on the SP Component stand under the Bergman tt, and again was shocked. I put them under components on the SP Rack and again thought them an improvement. Then I bought the Exemplar XP-2 preamp with SP SSs as feet allowing it to be directly mounted on the rails of the SP Rack. It was strikingly better, causing me to believe the acrylic shelves were harming the SP Rack.
Then came the SPs Ultra Fives. I know that on SP Component stands 4 Ultra Fives if carefully adjusted to have all four equally tight against the amp or turntable is just fantastic. Never have I heard anything even approaching it.
I grant that the Minus K platform are a different technology than the Halcyonics but neither I would believe could have the magic I hear with the SP Ultra Fives. I should say that the Ultra Fives are difficult to use under component that have large built in feet. They are so big that for them to avoid the existing feet you have to go into the center of the component. I use SP Ultra SSs on a replacement of the acrylic shelves on the SP Rack called the Grid. I have not really tried to use the Fives on the Grids.
Later I added SP Ultra SSs for under the speakers. They were dramatically better than the Townshend speaker cradles. I got some more for under the amp that was already on the SP Component stand. I was shocked. I tried them on the SP Component stand under the Bergman tt, and again was shocked. I put them under components on the SP Rack and again thought them an improvement. Then I bought the Exemplar XP-2 preamp with SP SSs as feet allowing it to be directly mounted on the rails of the SP Rack. It was strikingly better, causing me to believe the acrylic shelves were harming the SP Rack.
Then came the SPs Ultra Fives. I know that on SP Component stands 4 Ultra Fives if carefully adjusted to have all four equally tight against the amp or turntable is just fantastic. Never have I heard anything even approaching it.
I grant that the Minus K platform are a different technology than the Halcyonics but neither I would believe could have the magic I hear with the SP Ultra Fives. I should say that the Ultra Fives are difficult to use under component that have large built in feet. They are so big that for them to avoid the existing feet you have to go into the center of the component. I use SP Ultra SSs on a replacement of the acrylic shelves on the SP Rack called the Grid. I have not really tried to use the Fives on the Grids.