When you have a wardrobe full of tubes/amps, instead clothing. :D
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