The Etymology of the word means "audio lover". Based on that I'd say an audiophile is just that- a music lover who seeks to elevate the listening experience of his favorite music.
You're not a true audiophile unless...
I can't tell you the number of posts I've seen that start with something like this. Why are some people so anxious to qualify this like it's some sort of title? Being an "audiophile" isn't a concrete or objective thing like the citizenship of the country you were born in or being an MA. It's reflective of your hobby or taste, much like calling yourself a "foodie." Can anyone else chime in with some of the more ridiculous qualifications people have come up with for calling oneself an "audiophile?"