hi guys i am so confused right now what to do with my 5.1 speaker. My motherboard has a Realtek AC898 onboard audio chip and im not satisfied with the sound quality. here is the scenario




1. here is my speaker
http://dcicomp.com/old/parts/speaker...sch%20pm51.jpg


2.this is the back of my speaker
http://www.soundwise.org/klipschubb/...sub-back-L.jpg


3.and this is what it looks like when all powered speakers connected and the 3 inputs (sub/center)*(front L/R)*(back L/R)
http://http://imageshack.us/photo/my...927212741.jpg/


4. this is the 3 outputs for the (sub/center)*(front L/R)*(back L/R)
ImageShack® - Online Photo and Video Hosting


5.and this is my ASTRO MIXAMP PRO 2011
inputs:
http://www.gamergeddon.com/wp-conten...e/mixamp-4.jpg
output:
Screenshot by Lightshot




can i use this to connect to my astro?
Amazon.com : 9 Inch 3.5mm (1/8") Male to 3x Female Stereo Splitter Audio Cable, Gold-Plated : Electronics Cable Connectors : Electronics
but i doubt if the sound quality will not be minimized...


or


i should buy this Digital to Analog Audio Decoder Converter
Amazon.com : Digital to Analog Audio Decoder Converter - Transfer the DTS/AC-3 Digital Signal and Stereo(R/L) Audio Signal into 5.1 Analog Output : Electronics


or ill just buy an external soundcard?
Amazon.com: ASUS XONAR DG Headphone Amp & PCI 5.1 Audio Card: Electronics


guys i will really really appreciate your help,