Using Xonar Essence STX with Edifier S550 or 5.1 Systems

I saw a search query on the stats on this matter so i'm starting a post to give information about it,just in case anyone needs it.

So this is how to and when you can use a Stereo Sound Card/DAC like Xonar Essence STX with a Multichannel System like the Edifier s550 for Surround Sound.