Well your english is even uglier than mine, so I'm not sure I understood you well.
As far as I know, you have 8 amplifiers (or 2 quad ones, whatever) with 8 speakers
Right?
And your problem is feeding them with audio from the soundcard
It's very easy. The three ports in the back of your computer contain all the connections, forget the MIC or LINE IN markings. They are not valid anymore if the 8 channel function has beed enabled on the software included with the soundcard
___________________________
For example (I'm just guessing, DO NOT use this layout, yours surely may be different)
Stereo Out
Pin 1: GND
Pin 2: Front left +
Pin 3; Front right +
"MIC" (as I said, is not mic anymore)
Pin 1: Humm ¿Subwoofer channel? +
Pin 2: Rear Right +
Pin 3: Rear Left +
"LINE IN"
Pin 1: Mid-right channel +
Pin 2: Mid-left channel +
Pin 3: I don't know.... ¿center mid channel +?
Buy some 3.5 mm plugs and start playing to find out the correct combination for each amp and speaker