Logitech Z-5500 + SB1090 + Sager NP8662

Hey all,

I know nothing about audio, but I love music! I've been trying to do research for a few hours, but keep getting confused.

Here's my current setup:

Logitech Z-5500 5.1 speakers (fronts, rears, center, sub)
Soundblaster 1090 USB Card
Sager NP8662 Laptop

I want the best possible audio quality setup...down to drivers and up to cable setup.

Here's the back of the SB1090:


Here's the back of the Logitech control pad:


Here's the cables included between both hardware sets:
(from logitech)

(from soundblaster)

I have no other cables, but am willing to buy whatever is needed.

I will ONLY be running the speakers to the sb1090 and then directly to laptop - no xbox, tv, etc. I have the green/orange/black cable hooked up to the logitech and soundblaster via the Y-Splitter (each color hooked up from the logitech control pad to the sb1090 rear/sub/left/right ports) - but I feel like I'm losing some quality by doing that???

How do I get the best sound quality possible?   :confused: