Industrial Power Filters Beat Audiophile Power Conditioners (in Measurements)

[Holmz]

How did the judgement that low EMI improves system sound come from measurements ?

Probably because they didn’t work when hammered by interference.
And that “system sound” could be RADAR or long distance radios, etc.

Let’s not pretend like a bunch of prima donnas doing audiophile stuff are the end all of the electronics, RF, etc.
The main difference here is that one set of power conditioning is made for industry and has some pedigree or expectation to perform to some known standards.
The audiophile set are more generally imbued with magic and also generally have no published proof as to how well they work.

And that all comes before anything to do with how well equipment that they are feeding is designed to cope with the incoming power.
It’s an absolute wild-west with unknown power conditioners feeding unknown equipment.
There is little done to show that say the rails of a device are holding a more stable voltage when the power conditioner is feeding it, and/or whether something untoward is coming in via the nuetral or ground legs.

And that is before we get to the point mentioned by @Paul1960 as to there being a little correlation between what people like subjectively and measurements.

 

[Kingrex]

A possible reason there may be less published data and more flashy words with audio filters is the basic filter principles are known. As in, a choke and some caps will block certain noise. Or a cap can block DC. Its know concepts. If people knew it was a simple set of devices, they may not want to spend the money. Or question the cost. And the measurements from a audio vs industrial filter may not show any real difference. So why are people spending $9000 for one filter and $1400 for another that specs the same. That's not to say they don't sound different. One may use higher quality parts such as better wire, solder, duplex etc. And it may then in most people opinion perform better.