Prevent OS X to upmix my stereo signal when using 6 channel HDMI

I just bought a new MacBook Pro 13" (2015 version) and I'm used to watch series using my Windows notebook or Desktop machine plugged to my Home Theatre system with a HDMI cable. Because every series is produced in 5.1 and then encoded to a Dolby stereo signal everyone can have a surround sound experience when putting it through a Dolby Pro Logic decoder although the sound is delivered as 2 channel stereo. You guys may have noticed it when watching TV and then put the sound signal through a Dolby receiver. (http://en.wikipedia.org/wiki/Dolby_Pro_Logic#Dolby_Pro_Logic_II)
When I was watching my movies using my PCs it would send the stereo signal through my HDMI cable (set to 5.1) and at the receiver it gets converted to surround sound. But now when I watch using my Mac my stereo signal gets upmixed to all channels (which ruins the dolby signal) and my home theatre cannot decode it anymore.
It works when I put my HDMI settings to a 2 channel configuration in OS X's Audio MIDI setup but I want to keep it in 6 channel mode in case I have a 5.1 audio file or watch a 5.1 movie.

Not all MacBooks support audio over mini-Displayport. Use this user tip to find your model:
https://discussions.apple.com/docs/DOC-6413
And this one to determine if there might be a problem:
http://support.apple.com/kb/HT4241
If there is, I offer several solutions on this tip:
https://discussions.apple.com/docs/DOC-2821

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Attachments:
Class Browser.png ‏25 KB

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Gerardo O.
RF Systems Engineering
National Instruments
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Hi
First to thank you for taking the time to read and consider this if you do - any help in this would be hugely appreciated
Ok - I'll try to make this as concise as poss but it needs some explanation:
I'm home-recording hobbyist musician. One of the things I would very much like to use the iMac for is to back up old four-track tape recordings, recording them as wav or mp3 as the case maybe and saving them to my hdd. Easy right? Apparently not, so far... let me explain:
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Pancenter, thanks once again.
Sorry about delay replying - have had an internet outage here just to add to my woes haha.
Anyway, the good news is that I think I've cracked it:
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Peace.

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Prevent OS X to upmix my stereo signal when using 6 channel HDMI

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