Ever noticed the black rings on a headphone jack? Learn what they mean, how they affect audio, and why some jacks have more than others.

The job of a headphone plug and jack actually is very simple: to communicate audio signals from one device to another. These rings play a crucial role, not because of what they do, but because of what ...

The headphone jack is like a gas station in Manhattan: There are more valuable things that could be done with the space.