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? 🍔
