i used to not be real happy with the sound (i used to use the analog outs from the gtxp), since i switched to the external decoder its much better. for several reasons:
1) the nforce dd encoding just rocks
2) i have the volume on the z560's up fairly loud, and use the decoder remote for volume ... cheaper speakers like the z560 work better with more watts running through them.
i know its not audiophile stuff, but movies and mp3's sounds really crisp and can shake the room when I want them too.
it will hold me off tell I can afford the real goodies. I would love to hear whats klipsch's would sound like since 2,3way speakers are really superior for voice reproduction