Multi-Channel output audio from Quick Time (or iTunes)

Hello all,
I am trying to get multi-channel AC3 audio output from QT and can only get two channel stereo. I have seen lots of related posts but can't quite get it.
I am trying to configure a Mac Mini to output properly via the TOS link port to my audio system. I get surround sound fine playing a DVD but not when playing a .m4v file that does give me surround sound when played on my Apple TV.
Should this be possible?

I appreciate the link Brent! I also had someone point me here http://fplanque.com/dev/mac/ac3-ac-3-5-1-surrond-sound-apple-mac-osx and all is good now.
Thanks!

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