Mini Optical Output on MBP 15" Not Outputting 5.1 Surround?

Is the mini optical output jack on the MBP only able to send two channel audio? My home theatre receiver is set to the exact same settings as my PS3 and my PS3 sends 5.1 surround no problem. My PS3 uses HDMI and optical for video/audio. When I hook up HDMI and mini-optical output from my MBP my receiver will not detect full surround, it only uses two channels.
Any thoughts?

Hi eww,
eww wrote:
Da Vinci: The optical (not analog) audio output from a unibody MacBook Pro is in 5.1 channels if the MBP is playing a 5.1-channel source disc. An additional sound card is needed only if the source is not a 5.1-channel disc, in which case an external card will be needed to synthesize or simulate 5.1-channel sound from a two-channel stereo source.
You're right! After reading your above reply and subsequent 'Google searches' by myself I'm grateful to you for the insight.
So, all one really needs is an optical cable (along with an adapter) and a controller (which may or may not come as standard with the speakers).
It's always great when I learn something new and I am grateful to you for the correction.
Da Vinci

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