You might have noticed, over the last several years, headphones called "open back." What does that mean, and how does it compare to "closed back" headphones?

These new Dan Clark closed-back headphones are some of the best-looking I’ve ever seen – and promise even better sound. The sleek black-on-black design, complemented by Gorilla Glass 3-clad ...

HiFiMAN’s Isvarna closed-back headphones combine dynamic bass with planar clarity in a unique dual-driver design, redefining what closed-back planar-magnetics can achieve.

Audeze's LCD-S20 is a new pair of closed-back planar magnetic headphones pitched as the brand’s most accessible LCD-series model to date.