If you can hear it then a test device can pick it up
If true, this means that we have a complete understanding about how the human brain receives and process external stimulus. It means we have been able to quantify everything that has to do with how we hear and how our brain reacts to this stimulus. It means we have test equipment capable of measuring everything that has anything to do with how we hear and how our brain works.
which of course means.... it isn't true.
When someone says the tried something and it didn't improve the sound, that is useful to me. When someone says "Don't bother trying it, it couldn't possibly help," that isn't.
thank you