Thank you all for your answers.
AudioAero DAC only accepts SPDIF or AES/EBU connection, no USB, it is 13 years old DAC.
But with all upgrades I have done, it sounds better to me and my audio
buddies then AudioNote DAC4 Signature ( I have borrowed it for day for comparison), lesser DAC's we have tried do not even come close..
Additionally I have borrowed Transparent Reference XL Digital 1m (AES/EBU) from a friend ( he claimed that it is one of the best digital cable there are ) but there have been not audible difference to me with AudioAreo DAC, so I have stayed with mine Tara Labs RS-1 SPDIF (1.5m).
I'm storing my CD's in WAV format (uncompressed), they have been ripped using ExactAudioCopy on desktop PC running WIn7 and transfered to N10 internal drives using Windows Explorer.
For both AudioAero and N10 I'm using Shunyata Alpha Zitron DIgital. Both power cords are connected directly to wall the the some Furutech GTX socket, I'm using dedicated line.
So all is the some, just comparing CD transport with Aurender N10. I have compared N10 to some lesser transports like some SONY $1500 and some Philips, N10 was much much better in every sonic department, cheap CD transports do not even come close.
Maybe just CD-Pro2 used in Aero is that good ??? I do not know.
I have heard in some studios Lumina and other media servers $5000-$6000 (price range) and always have been disappointing (gray and thin sounding).
But I was extremely thrilled when auditioning some very expensive CEC transport (spinner), as good as good turntable.
But I do not want to invest money in XX century technology and physical media, I like the idea of storing music in digital files, but not in the expense of quality.