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1) Put soft stuff under components.
2) Put pointy things under components.
Get a piece of ply or MDF and use both.
Try first one then the other between the component and the board and the other between the board and the shelf.
You may even hear differences each way round.
It works like that in my system.
I prefer the soft over the pointy for digital sources and the pointy over the soft for amplifiers, and that's about as precise as I can get.
What you are looking for is loss of box resonations. This works for any item (speakers or component boxes etc.). There are four ways to accomplish this:1. Put something lossy around it to convert the acoustic energy to thermal energy (tennis balls, inner tubes, etc.).
2. Put a redirector on it (points, stands, etc.).
3. Reduce it at inception (ridgid supporting structure).
4. Change the frequency to one less problematic (very high compliance coupling or the reverse).
Take your pick of the above or try all together at once. The effect would be cumulative but probably not linear. Some may impart a sound of their own by taking away some microphonics but not others so in theory the best design would employ all four.
Unfortunately that's often expensive.
Much luck,
Shawn Harvey
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