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The stiffness of the springs is what controls the amount of vibration transmission that you get when a bump of a certain height is hit at a certain speed that puts you in the isolation part of that graph I posted.

Without damping factor in the struts, the vibration that gets through would cause an oscillation that would take a long time to dissipate, and if it was near the resonant frequency it could become violently unstable.

That'd be interesting for a non scientific audio product company to debate the science when they have no 3rd party laboratory testing behind their product.

Edit - actually strictly speaking, the damping factor of the material enters into the amount of transmission too. It would be more accurate to say that the stiffness effects the frequency at which you transition from amplification zone to isolation zone, which is the point of 0% isolation and 0% amplification.

For a 6" unloaded spring that gets compressed under load by 3" then you would be close with that ratio of 2:1 but it isn't really a ratio thing. The 3" compression just happens to be the result when you do the math for compression springs for 2 Hz resonant frequency.

What is at play is the spring constant K (Force per unit displacement), which isn't just a function of the material properties but also the physical shape and size of the spring (or elastomer). A typical coil spring has virtually no internal dampening. Elastomeric materials have dampening factors that reduce the amount of amplification on that graph I posted, but it is harder to get the properties and shapes and sizes needed to get the resonant frequency to be low enough. So most of those devices result in some amplification (with dampening) that somebody might actually thinks sounds better in their particular system but it isn't true isolation because the resonant frequency is too high for audio equipment.

Reflexive Counterpunch LOL LOL. That's a riot.

For a helical spring loaded with a mass, to get a resonant frequency of around 2 Hz, which is significantly low enough to give good isolation for audio equipment, you need 3 in. of compression under load relative from the no load condition, and you need there to still be some free compression available still.

Viscoelastomeric isolators like sorbothane use different math but they have to be pretty darn soft for typical audio equipment and they have to be a certain height to cross sectional area to get the resonant frequency low enough. I seriously doubt that a tiny amount of sorbothane in Herbie's Gliders can accomplish that. So called isolators like Herbie's Gliders are using a combination of dampening and isolation but the result is that it doesn't really isolate for all of the audio frequencies. For the lower frequencies it will actually amplify. The science is unescapable.




There's a sorbothane calculator somewhere that I had a link to.

Found it:

https://www.sorbothane.com/technical-data/design-guide-calculators/vibration-calculator/