Just to be clear I never said Robert’s product(s) doesn’t work or is/are ineffective or any such thing. My argument has to do with explanations of what vibration isolation is and what can be done to ameliorate it. It would certainly be a BIG MISTAKE to take the view, as Robert does, that because seismic vibrations, because their frequencies being generally below 20 Hz, I.e., BELOW the audible frequency range, that they can be dismissed as UNIMPORTANT. I am a physicist (theoretical propulsion and fluid dynamics a + ) with 20 years developing vibration isolation devices for audiophiles, including my erstwhile 6 degree of freedom 0.5 Hz resonant frequency Nimbus Unipivot which, if you can believe it, employs a single narrow air spring with very high internal pressure, technically almost impossible to construct. A little like trying to balance a large cinder block on a rubber pencil. But I can get 0.5 Hz performance. "What does LIGO have to do with audiophiles?" Best line of the thread.
As I have maintained over the course of this thread BOTH the vibrations on the top plate from various sources AND the seismic forces from various sources - Earth motion, traffic, etc. MUST BE ADDRESSED for optimum results. Of course, one can acheive good - though not optimal - results by choosing only ONE SOLUTION. It all depends on what you’re trying to achieve and where you get off. Even for seismic isolation there is no perfect solution since almost all such devices are mechanical low pass filters and because most do not address all 6 directions of isolation. I have always addressed both solutions and still do, by the way. Even the Nimbus incorporated dual symmetrical damping of the top plate.
As Shannon Dickson opined in his watershed article Bad Vibes, the first and one of the best tutorials on vibration isolation, in particular the details of the just introduced Vibraplane iso stand, published in Stereophile Magazine twenty years ago, "the only good vibration is a dead vibration."
cheers,
geoff kait
machina dynamica
As I have maintained over the course of this thread BOTH the vibrations on the top plate from various sources AND the seismic forces from various sources - Earth motion, traffic, etc. MUST BE ADDRESSED for optimum results. Of course, one can acheive good - though not optimal - results by choosing only ONE SOLUTION. It all depends on what you’re trying to achieve and where you get off. Even for seismic isolation there is no perfect solution since almost all such devices are mechanical low pass filters and because most do not address all 6 directions of isolation. I have always addressed both solutions and still do, by the way. Even the Nimbus incorporated dual symmetrical damping of the top plate.
As Shannon Dickson opined in his watershed article Bad Vibes, the first and one of the best tutorials on vibration isolation, in particular the details of the just introduced Vibraplane iso stand, published in Stereophile Magazine twenty years ago, "the only good vibration is a dead vibration."
cheers,
geoff kait
machina dynamica
