NAD C658 DAC vs TEAC NT 505


I am looking at DACs and I am probably going to chose between these two units
The TEAC has the AKM 449X chip and some really useful filters
The NAD has the Sabre chip and really is very useful for my no-preamp powered speakers
both do MQA and DSD
i do Tidal and digital computer files, no headphones usually, no vinyl
i want to get a used or B stock unit
canibefrank
I have the TEAC 503 DAC in one system. I like the sound. I have a Sonica DAC in a different system and like the sound. Completely different. The ESS is very precise and analytical. Very very detailed. The AKM is sweet and tube like. So it depends on your system. 
i currently have Airpulse Model One powered monitors with an AMT-Planar tweeter. I have the high end cut a bit with the bass boosted. I run a subwoofer. I feel the resolution is good enough that I am not looking for anything special to be gained... I am leaning toward a sweet tube sound ... I love JBL horns !!  but I don't know what I don't know...
i listen to quite a bit of mediocre recorded indie music, post-metal, blues, some classical, pop...hard rock....
"I am leaning toward a sweet tube sound" -- doubt you're going to get that from this NAD or Teac, tbh! Why not look at Metrum?