If your friend or family member ( mostly much juniors in age ) casually ask you to help them with a tip to improve their 2ch audio system set up ( with a very modest budget in mind ) and you keep explaining to him/her all about the sound quality and the equipments matching , till the person who asked gets emmensely bored and almost regrets asking you.
You know you're an audiophile if--
You just got a pair of speakers you can barely move yourself (inverse proportionality with age probably too)
The first house you bought cost less than your current stereo investment (ditto)
You have boxes of cables with which you don't know what to do
The first house you bought cost less than your current stereo investment (ditto)
You have boxes of cables with which you don't know what to do