There is no measurement involved in becoming a trained listener, or performing said job. A mechanic can listen to an engine and hear something wrong yet an average person can't do that. The mechanic can do that because he has a) heard that sound before many times and b) has fixed a component that made it go away. (b) is the critical component that is missing from average person who has heard his engine and thousands of other cars. The replacement of faulty part in many system confirms that the audible diagnostic is correct. That is what training does and is different than simply experiencing.Amir while im perfectly happy measuring , i dont listen to measurements, kinda boring
Ordinary people are not in a position to develop the training that the mechanic goes through. As such their diagnostic of what could be wrong is routinely wrong because they don't have a verification step that shows their conclusion to be right beyond any doubt (i.e. replacing the broken part above).
Implicit in what a mechanic does is knowledge of what an engine is and how it works. If you don't know what a valve is, you can't tell what a sticky one is either. I am not a car guy so not sure what I said even makes sense. But hopefully it conveys the message that becoming a trained person requires inside knowledge of what you are getting trained for.
In the case of compression artifacts for example, we know what makes codec's job difficult. That then translates into critical audio segments that are much more revealing than other types. Simple audience applaud is very difficult to compress. Strings are difficult to encode. So we pick short, 30 second or even less segments of audio that readily demonstrate the effect to trained listeners who perform a lot of AB tests with the original and impaired version. Over time the job goes from impossible to almost trivial. No matter how much music we have heard, or whether we are an audiophile for decades, we are unable to hear the same.
In the case of speakers and rooms, frequency response anomalies are the top characteristic to determine. Training programs exist to get one to not only become sensitive to them but also be able to accurately identify the problem. Likewise there are music tracks that make this job far easier than others. Again, knowledge of how frequency response varies informs us as to why these clips work as they do.
I was an audiophile for 25 years before I heard my first piece of compressed music and was ashamed that I could not hear the artifacts. I just thought as mentioned by a few others here that I would naturally have that talent. I did not and nor did countless other audiophiles that we tested. Trained listeners who were not audiophiles could beat audiophiles in their sleep in their ability to hear and identify specific problems.
It is an unfortunate truth. We like to think we all have golden ears but sadly we have tin ears when compared to trained listeners or the industry would not train listeners!