How to set up volume control on a DAC without a preamp

You could get a passive preamp like the Schiit Sys that will give you volume control. 

I think ROON has volume control.  I see it in the Audio-->device setup. select DSP Volume.  Then a volume control will appear on the device in ROON.

roons volume control will only work with usb or ethernet controlled dacs

then there aree xcellent dacs with a volume control

the bricasti m3 has one

and atolls dac streamers have full preamps as well

Dave and Troy

Audio Intellect NJ

Atoll Bricasti Roon specialists