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 ...

Size and cost constraints associated with the 3.5mm headphone jack limit the quality of the DAC and amp, but in Lightning-connected headphones, the DAC and the amp are built into the headphones ...

The headphone jack still won’t go away. BARCELONA — If you want your next smartphone to work with all of the wired headphones you may have accumulated over the last decade, the smartphone ...