One approach to be done with the problem without spending thousands on exotic platforms, is to combine coupling and decoupling techniques.
Couple the component to a large vibration-absorbent mass by building or buying a sandbox. Eliminate conduction of vibration across the top plinth layer of the sandbox by cutting the sandbox top layer into separate pieces to isolate each footer of the component. With a sandbox plinth cut up in this manner, there is very little difference between MDF, hardwood, or stone material as a top layer.
Decouple the sandbox using 5-6 low-resonance springs such as McMaster-Carr P/N 96485K125. The spring layer is critical & solves several problems, including absorption of remaining vibration from the sandbox above the springs, and decoupling of the sandbox from the rack below which acts as an antennae for airborne acoustic vibration & floor vibration. A sandbox by itself is not enough.
If you're mounting a turntable or CDP on top of a multi-shelf rack, to prevent ringing across the top of the rack from being conducted into the springs, add a 1.5" or thicker maple butcher block on top of the rack and rest the springs on the butcher block.
An ancillary benefit is that the springs can be easily moved around to level the TT or CDP.
It's amazing how many goners have TTs mounted on top of multi-shelf racks, with components on the shelves below contaminating the rack with vibration from AC transformers. If you must do this, at least try the above system to decouple the TT.
The total cost of this system is $200-$300 including DIY sandbox, springs, and maple platform.
Couple the component to a large vibration-absorbent mass by building or buying a sandbox. Eliminate conduction of vibration across the top plinth layer of the sandbox by cutting the sandbox top layer into separate pieces to isolate each footer of the component. With a sandbox plinth cut up in this manner, there is very little difference between MDF, hardwood, or stone material as a top layer.
Decouple the sandbox using 5-6 low-resonance springs such as McMaster-Carr P/N 96485K125. The spring layer is critical & solves several problems, including absorption of remaining vibration from the sandbox above the springs, and decoupling of the sandbox from the rack below which acts as an antennae for airborne acoustic vibration & floor vibration. A sandbox by itself is not enough.
If you're mounting a turntable or CDP on top of a multi-shelf rack, to prevent ringing across the top of the rack from being conducted into the springs, add a 1.5" or thicker maple butcher block on top of the rack and rest the springs on the butcher block.
An ancillary benefit is that the springs can be easily moved around to level the TT or CDP.
It's amazing how many goners have TTs mounted on top of multi-shelf racks, with components on the shelves below contaminating the rack with vibration from AC transformers. If you must do this, at least try the above system to decouple the TT.
The total cost of this system is $200-$300 including DIY sandbox, springs, and maple platform.