Hey laaudionut! I would suggest a streamer such as a Lumin D2- which is what I use. It will connect directly to the Motherlode using RCA cables (it also requires a cat5/6 cable to your router) and then you download the Lumin app onto your Macbook. I use an iPad, but it should be the same functionally. You can then use Tidal, Spotify, Airplay, etc, to stream music from the Lumin via the wireless Macbook controller. I love mine and find the fidelity to be quite satisfying! There are other streamers I'm sure as well. Another feature of the Lumin, is you can try it using its built in DAC, or run a digital coax to your current DAC from the Lumin. I'm not sure which you'll find to have better sonics, but it's easy enough to compare (and then possibly sell your current DAC to recoup some of the cost of the Lumin).
All the best, Aric