Every dac up to my current one (Lumin X1) that had volume capability seemed to reduce detail (reduced bits).
You turn them down too much. < 75% of full up = "Bit Strippping"
In that case, use a $49 Schiit Sys after the dac, to set the level, so then you can then use the dac’s remote volume control at >75% and over
Cheers George