Older DAC connection to my Macbook??

Indeed. As well as constantly advancing DAC chip technology. But there's nothing wrong with older units if the rest of your system isn't top of the line, state of the art stuff.

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.