I would go with a USB/SPDIF converter. I have used many with older DACs. Use an Audiophileo 2 with Pure Power power supply. They come up used here on AG. Wiith the added power supply probably run ~$500-$600. In the interim you might get a Music Fidelity V-Link or M2tech Hiface converter. Either should run~$100 used and easier to find I use the Hiface in a 2nd system.
Older DAC connection to my Macbook??
I'm looking at an older Esoteric DAC to possibly buy but have only connected my current DAC with a USB to my Macbook Pro. The Esoteric doesn't have a USB. How would I connect it? Thanks for any input.