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In Reply to: RE: Magnetic Levitators - Houdini posted by djost on July 20, 2009 at 21:21:00
I can't imagine any situation where these would be preferable to old fashioned springs. These things will pass vertical vibrations like springs (as the bottom part vibrates, its distance to the supported object varies, which varies the strength of the repulsive magnetic force, which moves the supported object - hence transfer of vibration), and there's no obvious way to dampen the vibrations (unlike springs, where you can put foam inside the spring as a damper). I will also guess that, unlike springs, they don't offer any isolation from horizontal vibrations (the moving part has to be constrained horizontally somehow, and I expect it's a mechanical restriction - i.e., the part that moves vertically is constrained inside a cylinder, and it's that physical contact that would convey horizontal vibrations).
For a turntable, if I thought the table's base wasn't isolated well enough (like a Rega), I'd use a heavy piece of wood on springs or foam (depending on weight and the frequency of interest - foam's probably less effective at low frequencies than springs). Many years ago VPI made a turntable platform like this - a laminated steel and wood plate resting on foam-damped springs. Works well - I still use mine.
No other component should have enough microphonics to need such isolation. (For example, CD players don't require isolation - there's plenty of error correction in the signal processing to eliminate the need for physical vibration isolation.)
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