Thanks for the comment. Yes, expensive to make. And tricky to build and difficult to ship. Three strikes, you’re out. But as we know now, mass-on-spring iso devices are excellent at reducing vibrations originating on the top plate, including the impact of acoustic waves, as well as seismic type vibrations originating from the floor.
Showing 11 responses by geoffkait
What am I, back in 1985? My Nimbus was the first audiophile 6-D iso platform. D stands for Degree-of-freedom, or direction. Since the horizontal plane ✈️ comprises an infinite number of directions 🔛, there are effectively more than six. You got your vertical. 🔝You got your three rotational directions , one around each of the x, y, z axes. 🚁 We split the difference and say the horizontal plane counts for two degrees of freedom (directions) for 6 total. The reason the number of directions is important is that the waves of seismic type vibration have six directions, all of which affect the audio component to some degree. Like a wave passing under a boat 🚣♀️ on the ocean. Oh, the Nimbus resonant frequency Fr is lower than 1 Hz for some of the directions. Nimbus uses only 1 airspring which just between you and me is practically impossible since almost any significant load will cause the airspring to flop over, even when it’s pumped up to 40 psi. It’s like trying to balance a 5 LB weight on a rubber pencil. The advantage of a single airspring isolator is you get extremely low Fr - every airspring (for stability) you add raises total spring rate and thus Fr. As it turns out you can get very low Fr and 2 Hz performance in many directions without all the hassle simply using small springs. Where’s the beef? 🍔 |
millercarbon This is why all the very best stands are super solid and stiff. No one makes a six dimensions rack. Even if there were six dimensions, the one guy who never will stop bragging about it never has made more than the one contraption, and gosh I wonder why? http://www.machinadynamica.com/machina24.htm >>>>>Somebody needs a refresher course in basic physics pronto. I refuse to mention any names. |
I’m not referring to earthquakes, Mr. Smarty Pants. I’m referring to the everyday motion of the Earth’s crust. The specific term is microseism. See, you learn something everyday. Well, maybe you don’t, how the hell would I know? If Earthquakes was all they had to worry about LIGO wouldn’t have needed all the isolation stuff since their experiment was way out in the boonies. Besides Earthquakes and trains you can add high rise buildings, construction sites, beaches, roadways, bus lines, and areas like CA and NV with very high microseism activity. |
Not too make to fine a point of it but the really cool thing about low frequency seismic type vibrations, generated by the Earth crust and traffic mostly, is how super strong they are. 🏋🏻♂️ They can vibrate 700 lbs like it was a feather. People think they’re safe on concrete slabs, too. If mass was the answer LIGO would have built a massive stand for their electronics to detect gravity waves. But they didn’t. They built a spring isolation system. Just when you thought it was safe to go in the water. 🦈 |
Ironically the best approach is actually a stand that allows the turntable to move freely in all directions, I.e., an isolation stand. The best isolation is achieved when the component can move easiest in all directions, all six of them! There used to be the Flexy Rack that achieved some degree of isolation by being the opposite of rigid. Rigidity and mass are the enemies of high performance. |