[Halcyon]

Some DVD players come with DVD audio playback special facilities to take full advantage of it but they shouldplay on a normal DVD player.
The quality of the audio is even higher than a normal CD with a higher sampling rate and of course the facility for multi channel audio.
I'd reccomend you have a very good Hifi hooked up if you really want to notice some differnce between a DVD and a CD.
You are more likely to notice the extra features like on screen lyrics or whatever else got bundled with the disc.