Headphones have changed a lot over the last 20 years. First they were accessories; then they were legit listening devices but as ugly as an outhouse; then they were bright plastic necklaces and a rapper's gravy train; but of late, they're becoming a very human interface to our tunes, designed to sound good, look good, and feel good.

The Philips Fidelio L1 is a perfect example of such a headphone.

A more creative engineer may add a few tricks of his own to the standard brew. Bigger and better regulated power supplies, careful circuit-board layout, tweaky passive components, and attention to detail will likely make this designer's product sound better than the same basic building blocks implemented without this care. Indeed, the vast range of sonic flavors from digital processors containing very nearly the same parts attests to the designer's influence over a digital processor's sound.