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In Reply to: RE: DIY vibration isolation Quadra Super Ultimate Isolation System posted by zvovchik on January 15, 2016 at 22:59:15
..all of these gizmos are system dependent. I found things similar to these to be most effective in the mids and highs, but not so much in the lows. I use big brass cones (Bear Paws) under my turntable for the best isolation for ME.
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The sturdiness/stiffness of the audio rack and the floor play a huge role on what works best IMO.
ET
... putting a lump of something solid (brass) between a component and a shelf(?) is not isolating but coupling.
If you use something shaped like an original tiptoe, and if you can locate the vibrational nodes in your shelf using a stethiscope, the tiptoe shape (point down on the shelf, flat surface in contact with the bottom of the component) will be diodic; vibrational energy will flow to the shelf (as you suggest), but there is no efficient path for energy to go back up into the component (again, if the tiptoe is sitting on a vibrational node, which is fairly easy to locate).
... the shelf vibrates which will move anything resting on it.
I guess I did a bad job of making my point. When a solid object vibrates, there are vibrational nodes. A "node" is a small area on the surface that does not move. I cannot describe this phenomenon in words so it is absolutely clear, but I think of two children swinging a jump rope between them. Where the children grasp the rope, there is essentially no movement of the rope; the children are at the nodes or represent the nodes. At the center of the length of rope strung between them, there is maximal movement. That's what happens when a shelf vibrates, too. These points can be fairly easily identified by tapping on the shelf while listening with a stethoscope at various points on the surface. If you place a tiptoe or any other footer over such an area it will not be activated by "vibration" of the shelf. If you use tiptoes judiciously in such a manner, you can pretty much avoid excitation in the vertical direction of gear that is supported by the tiptoes. In that sense, the tiptoe acts like a diode acts with respect to voltage.
Hey Fred....KMA Everyone knows what I'm talking about
Do you need to go that low?
... you are coupling to dissipate energy not isolating to avoid it.
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