TBH you're not going to notice a great deal of difference between your on board sound card and if you went out and bought a sound card.
I don't quite understand what the comment about blowing the on board sound was all about...
quite simply this wouldn't happen for four (logical) reasons.
1, if it'd blow the on board sound controller, then it'd blow a PCI card as well
2, the output for sound is line out, the speakers are self powered.
3, if the on board controller did have an amplifier, and it were speaker out, it wouldn't blow, since it'd be designed to run on an 8ohm load, and the input impedance of the amplifier would run a lot higher than that, so less power would be drawn.
4, if the on board controller, were powered, and the speakers were not powered, they'd measure 8ohm impedance, this would be what the controller would be designed to deliver, so it wouldn't 'blow'
basically short of trying to drive un-powered (very low impedance) speakers from a line out signal (and even then it's still really really unlikely).
it just makes no sense, there is pretty much no way to blow the on board controller by attaching audio equipment to it!
Did anyone else notice the gap in the frequency response of those speakers.
bass 20 - 180Hz
satellites - 200 - 20,000 Hz
what happened to 180 - 200 (which is audible)