Sorry, I forgot that feature is only available for the flagship AV10.
It is mentioned on page 192 in the Owner's manual.
This is the first time Marantz subtly/virtually/sort of/almost/vaguely, admitted the so called/claimed "Marantz sound" (presumably the warm sound) is due to the DAC filter, as it rolls off the high frequencies.

Take a look:
If you think your hearing can discern such as minor roll off that mainly affect >15,000 Hz, then sure, you may hear a warmer sound depending on the kind of contents you listen to. The fact is, that's with digital contents at sampling rate of 44.1 kHz, if you listen to contents at higher than 48 kHz, there is little to 0 chance you can hear roll off that starts at much higher frequencies, that is in the ultrasonic range.
View attachment 317742
The AV10, in my opinion, is the best available and affordable (relatively speaking) AV preamp processor, that allows you to a) select Audyssey or Dirac Live, and b) Marantz sound or Denon sound lol.