External DAC?

@daleberlin you’re right, I went through that section but couldn’t figure out which ref level and volume should I go with. Looks like it depends on the output Volts of the amplifier. Any idea what’s the output V of my PM Ki ruby amp? I couldn’t find anything on marantz manual either. 

@ghjuvvani I understand that balanced will mean +6dbu to the ref level selected. Any idea why you chose to use volume on both instead of locking one? Any sonic benefits? 

I typically just leave the volume on the integrated amp (which has balanced input; Marantz doesn’t seem to have it) at about 9. It can be controlled from a remote but very ergonomically, so it is simpler to adjust volume from the (great) remote that now comes with the RME ADI-2 DAC FS. I sometimes also adjust balance, a control that my MF M6si does not have. Volume is changed in the digital domain so it’s perfect. Withe the remote you can also dim the display which is a great feature. This DAC is great with my beyerdynamic headphones and IEMs!
I don’t remember my settings for balanced vs RCA but can find out that discussion
https://forum.rme-audio.de/search.php?search_id=657718769

I found it: "I just changed line out reference level to +1dB, as XLR out adds 6dB, to achieve the recommended +7dB"

So for balanced, I use +1 dB out ref level (higher levels were leading to distortions). I don't use line out any more but the ref level was higher. It is important to get this right!

If you lock or set the volume to fixed on the RME can you still use the EQ features? IMO that is one of the best features of this unit. 

@prashanth13485

your settings are correct i believe, it is how i used it

you want the auto level working at max db for max effect, it uses the full dynamic headroom of the akm dac chip set that way