Understanding the Mac’s Surround Sound Capabilities
A Mac computer can pass AC3 files, the file format used for Dolby Digital, directly to its optical audio output. Macs can also send surround sound via an HDMI connection, and even use AirPlay to send surround information to an Apple TV. The process can be as simple as plugging in an AV receiver with surround sound decoders or hooking up an Apple TV up to an AV receiver. Before you get started, however, you’ll need to configure a few settings on your Mac, depending on whether your source material comes from iTunes, a DVD player, the VLC media player, an AppleTV, or other options. For example, if you have a Mac with an internal or external disc drive, and you rely on it to play DVD or Blu-ray Discs, then the AC3 track will automatically be sent to your Mac’s optical audio output. But if you want to send the audio and video to your Apple TV via AirPlay, you may need to use third-party software like VLC media player.
How to Configure VLC
If you have a video file on your Mac that includes an AC3 channel, and you use the VLC media player to view the video, you can send the AC3 information to your Mac’s optical audio output or AirPlay, but you’ll first need to configure VLC to pass the AC3 information. Here’s how:
Configure VLC to Use AirPlay
Here’s how to set up VLC with Apple AirPlay.
iTunes and Surround Sound
iTunes supports surround-sound playback, though most music and TV shows in the iTunes Store don’t contain surround information. However, movies you purchase or rent usually do include surround sound information. iTunes can pass the surround channels to your AV receiver via your Mac’s optical audio connections. Your Mac just passes the surround info; it doesn’t decode the channels, so your AV receiver must be able to handle the surround encoding (most AV receivers can do this without a hitch). By default, iTunes will always try to use the surround channel when available, but to make sure, start the movie and then select the speech bubble icon located at the bottom right of the playback controls. A pop-up menu will appear, allowing you to select the audio format to pass to your AV receiver.
Configure DVD Player to Use Surround Channels
If your Mac has a disc drive, the DVD Player application can also make use of surround channels if they’re present on the DVD. Before you start, connect and configure the surround speakers or AV receiver to your Mac. If using surround speakers, refer to the manufacturer’s instructions for setup. If using your AV receiver, make sure your Mac is connected via an optical connection, the receiver is turned on, and the Mac is the selected source.
