Headfi Audio for Dummies

Last year I wrote a Stereo Building for Dummies post laying out the basics for a loudspeaker system. In the last couple of months I’ve gotten a few similar questions about headphones and their care and feeding, so I thought it would be worth putting together a quick outline of the basics of headphone hifi, or Headfi. I’m going to focus primarily on digital media in this post, but much of it (except the parts about DACs) will also apply to a purely analog system. I’ll start by reiterating my four rules of hi-fi audio, then get into it: You like what you like. The most important factor in judging an audio system is also the simplest: does it sound good, to you, in your space, and listening to the things you want to listen to? [1] Many of my fellow audio nerds spend a lot of time arguing about objectivity and measurements, and that seems silly to me. Do you like the $5 headphones that came with your phone? Sweet! Enjoy! Do you want to spend $25,000 on a set of Macintosh separates? Awe...