[Puma Cat]

Originally Posted by clpetersen

Tima - good points. Yes, anyone claiming vibration damping should provide measurements (it is easy and inexpensive to do, folks do it everyday). I recall Stephen (Puma-Cat) did that in his home set-up (correct?)

Yup! I used an iPhone app called VibSensor and measured Power, RMS imparted to the component (in this case, my Schiit Gungnir DAC) from a "slide hammer". The slide hammer was a socket on a bolt with a nut to precisely and reproducably fix the distance of the drop of the socket onto the rack shelf precisely (to remove variance). I simply raised the socket up to the stop nut, and let it drop onto the head of the bolt resting on the shelf, and then plotted the vibration imparted to the iPhone resting on the DAC.

Here's the Z Dimension vibration data from VibSensor plotted in JMP as Power, RMS from 0 to 50 Hz. The stock Schiit feet were the worst, and the very affordable Herbie's "Tenderfeet" (red trace) did quite well given their price, but Norm Varney's EVPs (blue trace) were the most effective by far. DVT were the rubber and "blue rubber" Diversitech anti-vibration pads. I'd love to do this test with IsoAcoustics footers, but I don't have any around, and unfortunately, VibSensor is no longer available as an app.



The data is clear, though, in showing that Norm's EVPs are the most effective, by far...none of others are even close.