Can a California Audio Lab Delta D/A be used with a FLAC USB music collection?

I have a 'separates' stack system from the early 80s.  Is there a way for me to use the currently used California Audio Lab Delta D/A to create music from a FLAC USB music collection?  It was suggested that I get a BlueSound Node 2i which will work with my Conrad-Johnson PV-11 preamp, but since I already have a D/A I hate to see it go unused.

I appreciate your input on the BlueSound Node 2i devise's quality and if some other method or devise could work with the CAL Delta D/A?

Your opinion is appreciated.