There are a couple of comparisons of the AN DAC 3.1 to the 2.1 on the Audio Note Kits website at Audio Note DAC Kit 3.1 Balanced / RCA that also gives info on upgrading the 2.1 to the 3.1 DAC.
I would let your kit DAC do a complete burn-in and become accustomed to the sound before proceeding with any upgrades. I'm sure it sounds great. Enjoy it.
I would let your kit DAC do a complete burn-in and become accustomed to the sound before proceeding with any upgrades. I'm sure it sounds great. Enjoy it.