If you have ever watched Netflix, Disney+, or Amazon Prime Video, you have almost certainly listened to E-AC-3. You just didn’t know it.

When you see "Dolby Atmos" pop up on your Netflix app, your device is decoding . It is not lossless, but it is remarkably efficient. Dolby's internal testing suggests that a 448 kbps EAC-3 Atmos stream is perceptually indistinguishable from the studio master for 95% of consumers on soundbars and standard home speakers.

For those interested in the technical aspects of EAC-3, here are some key details:

Here is everything you need to know about this powerhouse codec. What Makes EAC-3 Different?

Here is the big one. Dolby Atmos requires —meaning sounds move around you in 3D space. On a 4K Blu-ray, this uses the massive "TrueHD" codec.