Some Questions(Xonar DS/Microlab Solo 6c Related)

[Izuall]

Hello guys i kinda need ur help in improving the sound quality(or better said getting the sound that i like...)of my budget speaker system and sound card.
I currently own a Xonar DS& a pair of microlab solo 6c pc speakers...

Ive tried some OP amps(The LME4970,AD823 and OPA2228 besides the stock)
My experices...the LME seems to have the most precision but lacks in warmth,
its dynamics are also great.The OPA has warmth and good detail soundstage is allso good on the OPA but it lacks dynamics its too lean...the AD chip has a very nice soundstage and dyanamics but its not warm in any way.
Is there a single chip that would work with the DS that would allso sound warm..like the opa but have good dynamics and precise bass?

If Not...

My microlabs have a NE5532P op amp onboard ..anyone know what it does?
Is it part of a preampstage?(if so can i put a socket in its place..cuz its soldered on..and try a few combinations..what combinations would u guys suggest?)

If Not should i add a preamp between the 2(speakers and card?)
What DIY preamp should i build(op amp based prefrable allso easy to make)?
And again if i cant get what i want in a single chip?what combo should i make?

PS.Any remarks are highly welcome(Im a noob in electronics).
Ty in advance

[Izuall]

Here is the schematic if it helps
http://images.people.overclockers.ru/148673.jpg