I'm interested to find out more options regarding this too.
I do a bit of home recording (using a laptop with a USB interface), and use a pair of active monitors that have two input channels : RCA, and XLR or 1/4 inch.
Due to space constraints in my room, I have my CD player on my desk as well, with the outputs routed to a passive volume control (Nano Patch +) before they go into my active monitors. This way I can easily control the volume instead of using the volume knobs on 2 active monitors.
I also have a DX90 (containing FLAC files that I ripped from my CDs and hi-res tunes I bought online) that I run into the 1/4 input of the active monitors.
Looking to get a more elegant solution to this so I can have one centralized volume control for the DX90 and CD player, be able to switch between the 2 (or possibly 3 in future) audio sources, with the output going into the active monitors' RCA input, as well as a headphone output of good quality when I intend to use cans.
Anyway, one option that I came across doing research on this, that might work for the OP is the Centrance Dacmini PX :
https://centrance.com/products/dacmini/px/
No experience with it yet, perhaps others can chime in.