Is my AVR DAC good enough or should I buy an external DAC?

Here’s some related stuff on the Allo DAC.

Personally, I have an Anthem MRX 720 AVR which I use as a prepro. It is a good quality component, as is your AV6000. That said, I use a couple of external DACs in my setup. Comes down to if you like the sound signature of your AVR. What are you using for Roon now?