**** The question becomes, how does an audiophile who is not a musician, or who has no musical training, study, learn and practice his/her listening skills other than the ideas offered in this thread? ****We enter this world with a super refined gift of a mechanism that we learn to ascribe words, definitions and understandings of what it is we hear. By the time we're 5 yrs old, some of us are using adult grammar, fully understanding it, for crying out loud.
Having a hobby which involves hearing is simply a plus and how we refine it is innate (you know, born with it). The fact that there's a science to it only validates it.
I've never played French Horn or slept at a Holiday Inn but I've refined my hearing more than the average bear and don't require a PA system to properly ascertain what I hear. Like I said, it's innate, as is the refining process. Some are better at it than others but it's safe to say, most here get it, and they're not musicians.
All the best,
Nonoise