What am I listening to, it can't be Digital?

Ah yes, headphones...that would be part of the magic. Enjoy your fortunes:O)

I've only got two Music DVD's so I'm not real smart about this stuff but my James Taylor "One Man Band", and Cowboy Junkies "Trinity Revisited" DVD's have set up menus to change modes from 5.1 surround to 2 channel stereo. Is it possible that the "set up" menu on your DVD is set to 2 ch stereo verses 5.1 surround? By the way, the "Trinity Revisited" DVD IMHO is amazing.

The effect you are hearing is the 24 bit high resolution content of DVD Audio. You are still hearing the stereo mix unless your headphone has separate five ear buds.

Dear Dave_b
Utilizing same Pioneer with Digital Co-axial out to Space Tech Lab DAC. Balanced Output from DAC to same said Space Tech Lab A-102 Vacuum Tube Integrated/Headphone Amp. Same set of Headphones with CD, sounds very-very-good. Still can't touch the sound of this DVD-Audio. Switch to this DVD-Audio puts at least a foot more Soundstage around the ears. Don't believe its the Headphones alone.
Dear Raks,
I'm not real smart about this stuff either, that is why I am trying to find out what it is that I am listening to. The Pioneer DV-58AV has two groups of Analog Out on the back. One group is AUDIO OUT (5.1ch) and includes all of the Channels for Surround Sound including the two front Channels. The other group is AUDIO OUT (2ch) which is utilized for two Channel Stereo. I am utilizing this last Output to my Stereo. To utilize 5.1 surround, my RCA Connectors would have to at least be hooked up to the 5.1 Audio Outputs. The AUDIO OUT (2ch) is separate from the 5.1 Channel Outputs. The Pioneer Menu allows one to select activation of either the AUDIO OUT (2ch) or the AUDIO OUT (5.1ch). Switching the Mode only activates the AUDIO OUT (5.1ch), 5.1 Surround can only be accessed from these Outlets, at least that is what the Manual says. The Manual does mention Downmixing of Multi-Channel DVD-Audio Discs to 2 Channel Stereo. I am still trying to figure out if this is accessed from the AUDIO OUT (2ch)-or- from the AUDIO OUT (5.1ch) Front Two Channels. The DVD-Audio Multi-Channel Disc also has to provide access for this 2 Channel downmix as well. The whole point is that what I am hearing sounds absolutely NOT like a Stereo Channels/Surround Channels Downmix. There is nothing Surroundish about it, the envelope of the Soundstage has tons of harmonic content, not delayed Surround Processing. Forward images have twice the intensity of presence, nothing like what I have ever heard on Surround Sound Systems. It may be a Downmix of Surround Channels, but the Surround Channels are loaded with musical harmonic content, not special effects. The Recording Studio might have decided to load the Surround Channels with harmonic musical content instead of the usual Surround Sound processed stuff. No matter what the cause, it sounds about as close to an Analog Record than any silver disc has a right to be.

My experience has been that DVD-A stereo sounds exceptionally good
(dynamic, resolving, etc), but I'm not going to get into comparisons with
analog because it's too subjective.

Have you listened to other DVD-A discs other than Diana Krall's? Just
interested to know your basis of comparison.

My hunch is that there's no down mixing going on, and that you're listening
to DVD-A stereo. If the DVD-A has both multi channel and stereo mixes, you
will have the menu option on the Pioneer DVD player of selecting the mix you
want to hear. That's the first step.

When you play the Krall DVD-A, your Pioneer player's display should indicate
which channels are being reproduced (L&R, or Multi Channel). All my DVD-A
or SACD players have done this (Denon 2900, Denon 3910, Sony DVP999ES,
Esoteric UX-3Pi).