5.1 Dolby Digital via optical cable in Mac Pro?

Hello!
I'm planning to get a new Mac Pro and I wanted to know if a Dolby Digital or DTS encoder is included to have 5.1 output with the optical TosLink cables.
I need this to connect the Mac with my 5.1 surround sound system because I wanted to watch DVDs using it.
If it only supports stereo sound in the standard version, do you have any recommendations to expand it to get the described feature?
Thanks for answers.

Hook up the toslink, set the output to digital in System Preferences>Sound, set the input on your 5.1 receiver and match the surround sound format in both the DVD movie sound prefs and the receiver.
That's it.
Remember to set the speakers in the correct positions from your sitting point or it won't work very well.
To test the surround sound I suggest the movie Castaway, where Tom Hanks is picking up Fedex boxes from the surf line. You'll hear the waves crash on the left, Tom walking towards you and coconuts falling on the right.
The toslink and a good receiver also makes your rips and iTMS songs sound great too.
Check out the Volume Logic iTunes plug-in as well, really makes the music sound great.
(no comp)

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