The TV part of the Apple TV name properly evokes that it’s built as a device to play video. It also has a screen-based interface for navigation. The new Apple TV goes a step further by adding support for richly rendered, smooth-motion games, and opening it up with an App Store. But the Apple TV, past and future, is full of music and spoken words, too—many people also stream audio from OS X and iOS using the Apple TV as an AirPlay target.
Which is why some owners of current models and potential new buyers were dismayed that Apple dropped the optical-audio port in the content box’s new design.
Read more: http://www.macworld.com/article/2983252/home-audio/apple-tv-drops-optical-audio-out-how-to-pump-up-the-volume-again.html