Dac will be a better option if u think the sound is digital. In this player cirrus chips are for used for analog conversion. It is decent but when u use Dac noise floor will be much reduced with instrument separation.
The Dac on the cd 6006 is quite good. No doubt there will be better independent dacs out there but in my case never felt the need for a separate dac with the cd6006 besides there is no audible noise too.