I saved alot of money.

I am confused.  In your original post you stated that the CD player and the BT were connected to the Hegel DAC, and you were comparing the sound from those 2 inputs.  In your last post, you seem to indicate that you have connected the BT device digitally  to the DAC of the Hegel, and that you also have connected the analog output of the BT to your preamp ( I am not familiar with the Hegel 390; for this discussion I am assuming that it is an integrated amp with DAC included).  If you are comparing the analog vs the digital output of the BT, then presumably the digital output is being converted by the Hegel DAC, and the analog is being converted by the BT DAC and then being outputted to the preamp section of the Hegel.  I would not expect the latter situation to sound alike.

Oops....I mistook the post by @reubent  to be coming from the OP, @golden210...

Satisfy yourself, that is what it’s about. You have a good system but the CD player is the weak link. So don’t take your test as the final answer. This is a hobby where we keep learning what works.

mahler123, to add to reubent's comment, when you connect the Auris Bluetooth via the digital output you are bypassing the Auris's internal DAC. So my Hegel's internal DAC is doing the work.
Thank you russ69 for you saying my NAD CD player is the weak link. I've had it for a couple of years. It was a huge improvement over my Technics carousel player that was under $200.00 20 years ago. I have never listened to a high end player. Since I'm only using the NAD as a transport would a much more expensive CD player give better results?
Thanks to all for your comments.

@goldern210.....No need to have to make excuses for using your cell for a 'head unit' to this immoral mortal....*G*  Been using a cell to drive the audio in 3 vehicles (Focus, Landcruiser, Dodge dually) and the 'shop' audio system with Spotify Premium.  The same service frequently drives my office system and the 'main' system.  (The latter too big to be mobile, anyway....office and main running Ryzen 5 processors...*L*)

Updated the cell to a Pixel 4A recently; haven't nosed around for any 'enhancements' as yet (usually an eq that has more bands 'cause of the varied 'environments') but will get around to it soon enough.

Understand a limited budget; although 'retired' in concept only, I've not free rein as to what I can spend on 'audio only' pursuits.  But there's no reasonable rationale to apologize for what one enjoys or the means of attaining such.  The 'digital realm' of audio is expanding daily, especially in terms of the device that's in your hand.

BTW...I do like analog, but since it gets 'run through' a primarily digital process en route to my speakers.....one begins to wonder and doubt....;)