Need help to transfer 5.1 audio via hdmi

Hi, guys!
This is my first post, I would like to apologize for my bad english.
Today I received my new Mini DP to HDMI adapter and, after a little configuration, I was able to make it work properly with my mac.
But, after all my work, I noticed that the audio transfered was only stereo, not 5.1 as my home theater can handle.
So I searched some forums for a bit and noticed that I could try to change my configurations in "audio and midi configurations" (this is a portuguese translation, I'm not sure how is the program's name in english). Once there, I saw a lot of choices for audio via hdmi, like stereo, 5.1, 6.1 etc, but only the first was availabe, all mutichannels were disabled.
Is there any way to make these choices available?
Can this be a limitation of my Mini DP to HDMI adapter?
In the item description, it says that it does transfers "uncompressed audio such as LPCM" and
"compressed audio such as DTS Digital, Dolby Digital(including DTS-HD and Dolby True HD)".
Thanks in advance!
Cheers from Brazil

As far as I know there is no way to carry more than stereo over HDMI.
I know very little about this subject and have no experience with it myself, but I've been aware for some time of this adapter:
http://kanexlive.com/products/iAdapt51.html
I take the description to mean that 5.1-channel digital audio can be carried by HDMI, and if the mini-Displayport doesn't output an audio signal that rich, the Kanex adapter should be a useful alternative. I've posted the link in reply to many queries in the past, but I don't recall whether or not anyone has posted back to say they've tried the adapter and tell how well it worked for them.

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kommy wrote:
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