What is the best way to connect the sound from HDTV to computer speakers?

I have a Gigabyte GA-X58A-UD3R motherboard.  I have a 5.1 analog speaker system connected to the analog outputs on the back panel.  When I stream Netflix through the computer, I have the option of setting the sound to output through the 5.1 analog computer speakers, order through the HDTV stereo speakers.  I prefer using the computer speakers to the stereo HDTV speakers.  

Here's my question:  what is the best way for me to send the HDTV sound from the HDTV to the computer so that I can use the computer speakers.  Do I use SPDIF in/out?  Which means I'd have to get the optional SPDIF accessory panel, or, is there a way to output the HDTV sound signal to the back panel line in jack?

I want to watch HBO/Showtime etc. using the 5.1 computer speakers.  
the gigabyte manual doesn't explain If I use SPDIF input whether or not the motherboard will automatically output the HDTV input to the 5.1 analog computer speakers?  

Thanks.  The whole SDIF thing confuses me.
AFTerryAsked:
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sdernConnect With a Mentor Commented:
It depends if your HDTV has a SPDIF output, most HDTVs dont have SPDIF out. Probably what you would want to do is use the SPDIF output from your Cable/Satellite box, which is whats receiving the HBO/Showtime and then have that send the digital audio signal to a S/PDIF input on your motherboard.

The panel of ports on the back of your computer only has a S/PDIF output port. However your motherboard does support S/PDIF input, but you need the connector, which needs to be connected to your motherboard S/PDIF IN pins (check your motherboard manual, page 32).

Idea:

(Cable/Satellite box or HDTV) S/PDIF Output --->   S/PDIF Input (on motherboard)

5.1 Analog Jacks (mobo) ---> Speakers
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AFTerryAuthor Commented:
A precise solution using insight by suggesting the use of SPDIF output from cable box!!  Thinking outside the box (pun intended).
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