Peachtree Decco 65 DAC observations

So I finally got around to putting the ESS Sabre 9023 DAC to the test in my new Decco 65. I ran my Arcam Alpha 7se to the AUX using Temporalis Silver interconnects and to the COAX1 using the digital out on the CDP with a Harmonic Technology Digital Silver interconnect.

Obviously, the Sabre DAC should push a better sound, correct? WAY better?

Well, the exact opposite actually. Doing the A-B test between the two, the sound from the analog out was so much more rich, dynamic and powerful...the sound from the digital flat and lifeless. I can't wrap my head around what is going on here! Any explanation or am I losing it?
The arcam alone is likely no slouch.

I found the following on the Arcam site about it:

The 7SE uses a latest generation 24 bit DAC from Burr Brown and also features lower jitter levels and improved power supplies. Arcam has added an optical digital ouput to cater for the increasing use of minidisc recorders in addition to the standard co-axial digitial output. The overall sound quality is exceptional for a player at its price. The 7SE maintains the upgrade capability of the the Alpha CD players; the units can be upgraded all the way to the state of the art perfomance of the Alpha 9 CD.

This indicates DAC quality/performance could vary widely depending on upgrade level.

Also Arcam in a few models once licensed and used the DCS Ring DAC technology, which is/was no doubt SOTA in many ways + sells for a huge premium in DCS products. That DAC in an ARCam priced unit was way too good to be true at the time and did nt last long as a result. Still, Arcam set a fairly high bar at modest price to strive for at that point with its follow-up products.
Thanks for responses Mapman. I always loved the sound of my Arcam since I bought it new in 1999. What Hi*Fi? Product of the Year Award in 99-00 might have influenced me :)

It just disappoints me that I bought this amp to utilize the built-in ESS Sabre 9023 Upsampling 24/192 DAC. Since I only have one analog input at my disposal that I already use for the turntable, it makes it inconvenient to switch between the CDP and the turntable.

I know the world of digital has moved away from CDs some years ago, I just haven't found or pursued a digital solid-state replacement.
I have an Arcam with the Ring DAC and an Idecco. Arcam is significantly better sounding - to me. Seems consistent with your findings.