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

2.this is the back of my speaker

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)

4. this is the 3 outputs for the (sub/center)*(front L/R)*(back L/R)
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5.and this is my ASTRO MIXAMP PRO 2011
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...


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,