Any one measured the EMI/RFI attenuation performance of audiophile power conditioners?

@audio_phool , buy some test equipment and start testing.

Or you could watch what this guy measured or not.

https://youtu.be/GAxOMfiqiVg?si=b7LUnTqzegOrmJQi

EMI testing requires a Faraday cage.  The video with the FFT analyzer testing the effectiveness of a PC on an amp is fun to watch but keep in mind that this is a comparative test.  Like when we listen to a stereo component, we compare it to something else we have heard- be it live music or another component.  That is a subjective evaluation.  What this guy in the video is doing is also a subjective evaluation but with an analyzer.  Just because he has a computer outputting numbers does not make his comparison less subjective than someone doing a listening test.  Many people with highly developed listening skills can match or outperform measurement equipment.  Especially because we don’t always know what to measure or how to measure it.  The guy in the video could do the same tests again on a different day and get different results depending on the state of his power grid and local interference in his area.

An objective test must start with a baseline that is calibrated and repeatable.  That is why EMI testing requires a Faraday cage.  That is the EMI equivalent of an anechoic chamber.  That way even his test equipment is isolated from outside influence.  

I’m not knocking comparative testing.  We often have no choice and comparative listening is how we make purchasing decisions.  Item A sounds better to us than Item B and so we are satisfied with our purchasing decision until we hear something better.

I heard a difference in different PC’s and I hear a difference with and without one.  That is how I made my purchasing decision.  If I can’t trust my ears who can I trust?

@vonhelmholtz I had written to Shunyata as per your suggestion asking them for the measurements & below is the response related to measurements.

"We've published our own measurements on our up-market Everest and Denali power distributors that show a -68dB down at 1mHz noise measurement, which is top in the field.

The problem is that too many variables exist to definitively say this PC will make this system sound better in this way or another system will sound about the same with or without the PC.  These manufacturers are making a product that reduces line noise.  If it makes the audio system sound better, that's almost a side effect.  

Published measurement data of these PCs might be one way to show that they are working but how they affect the sound of an audio system is almost incidental.  For example, plugging an amp into one could make the amp sound worse because it limits current.  Measurements can only go so far.

Supposing you bought two different cakes from two different bakeries.  You take those cakes to a chemist and have him analyze them.  He gives you a list of ingredients and relative weight of each ingredient.  That analysis might give you some idea of the flavor of those cakes but until you take a bite, you will not know how they taste.  Furthermore, the chemist cannot tell you how each cake was mixed and baked- the process.  And the mixing/baking process could have a significant impact on the flavor.  

@tonywinga completely agree with you on the part that one cannot say what and howuch improvement one can hear from adding a power conditioner in your system as there are a lot of variables included. Since the only job of this piece is to decrease the EMI/RFI from the power line, it’s a completely objective parameter to measure and report which these audiophile companies are giving a complete miss, hence my original post.

Audio_phool