@deep_333 I never said any of these products don’t make the improvement/changes to the sound. My post was regarding lack of objective measurements/performance data for something which is completely objective. Will FDA accept a new drug if tomorrow the manufactrer will just say I saw improvement in a patient’s condition?
Years ago, a group of engineers in a large manufacturing/test facility (defense/aerospace) were in deep sht with a certain kind of issue. The control system on some sensitive test equipment, one of a kind, one sole manufacturer in the world to meet specs, would freeze up due to some power anomalies that would occur in the midst of weeks long continual tests. Months of power monitoring with the most sensitive/most expensive equipment (that audio guys may have never even heard of) revealed that the monitoring equipment may not have been sensitive enough to catch weird sub-cycle spikes, etc or the ability to capture/characterize such anomalies in that industrial environment. There is nothing else to buy.
Solution: We isolated the control system on that equipment with some very expensive custom iso. transformers. The problem never re-occurred again.
If someone came back and asked me, "where oh where is the measurement/data trail that drove you to your grand solution?" All i could say is, "foff and don’t waste my time, the solution is in place!"...and that’s how it may work in certain types of industries at times.
FDA? Try and figure out all the complexities of the most sophisticated gadget in existence, i.e., the human body first..After that, we can talk about FDA and other crap (Most of your medication is apparently fixing one thing, breaking something else anyways).
Get a couple of engineering degrees, work in field for a few decades, start to get a feel for the limitations of what we can/can’t measure, how much we don’t freaking know in the grand scheme of things, etc, before you get really absolutist with some audio stuff. The internet read low info guys from the likes of ASR are the ones who feel mighty proud of themselves on a daily basis. They know everything there is to know apparently!