Any more improvement?

[Apocalypsee]

I hooked my Klipsch satellite directly to an old Dantax Model Pro 90 Surround Sound Processor (my father gave it to me) and it was a huge difference! Wider soundstage, there are layers of background and foreground that aren't noticeable before (background instrument doesn't sound mushy, muddy like before) and for the first time, I can hear distortion on 192kB/s mp3 files! The only downside is it makes the satellite even brighter than before, but for the improvement it gain, I can handle it

I have a question, will changing the sound card a better one makes anymore different that I currently experiencing? Thanks in advance...