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.

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I have a pretty nice rig. Parasound JC-1's with JC-2 preamp. I have an Exogal Comet plus DAC and Salk Song 3 speakers. My Arcam FMJ cd 23 cd player is getting up there in age so I saw an Esoteric transport and Dac for sale on here. The Esoteric stuff is 10 years old but very expensive and highly regarded at the time of release. I keep hearing about the 'detail' of Esoteric gear so I guess i want a piece of that. I would also like SACD capability which i don't have. My system sounds pretty musical now.
 
Have you tried it? What do you think? You definitely have an amazing system. When I said sota, I was thinking $100k+ systems.. Still think you've a ways to go to reach my completely arbitrary definition.
I haven't bought the Esoteric gear. I don't believe I want to get into having an extra adapter just to connect it.