What Is HD and Ultra HD Audio?
If you subscribe to Amazon Music Unlimited, you can listen to 100 million songs in High Definition (HD) and millions of songs in Ultra High Definition (Ultra HD) for no extra charge.
You can listen to HD and Ultra HD music on Echo devices, Sonos speakers, Fire TV, iOS, Android, Desktop, and more.
HD and Ultra HD playback is supported on the Amazon Music app for PC and Mac but not the Web Player. Actual experience depends on device and network.
A growing catalog of Spatial Audio mastered in Dolby Atmos and 360 Reality Audio is also available.
Spatial Audio is available through the Amazon Music app on Android, iOS, Fire TV, including select streaming devices, smart TVs, smart speakers, and home theater receivers.
HD audio quality is more than double the quality of standard quality streaming services. Ultra HD audio quality is up to 10 times the quality of standard quality streaming services.