Any audiophile use computer (MacBook) as your audio streaming source?

Supermicro is the first brand that came up. There may be less expensive options out there.

The need for a DDC is very system-dependent. Making blanket statements (like some folks) about its necessity often overlooks the specific characteristics of one’s setup. If a system already has a clean digital source, like the iFi Zen Stream, which excels in minimizing jitter and electrical noise (see below) as compared to the state-of-the-art DDC like Singxer SU-6 and Holo Red, adding a DDC could indeed be redundant or overkill.

In such cases, the additional conversion step could introduce unnecessary complexity or even compromise sound quality due to the increased signal path. As with any audio component, the key is knowing your system's strengths and weaknesses before deciding whether to introduce something like a DDC.

Jitter Tests

Electric noise

If a system already has a clean digital source, like the iFi Zen Stream, which excels in minimizing jitter and electrical noise (see below) as compared to the state-of-the-art DDC like Singxer SU-6 and Holo Red, adding a DDC could indeed be redundant or overkill.

@lanx0003  Well, I use a Denafrips Iris Fed from my iFi Zen Stream (with iPowerX power supply) and the improvement is significant.  I bought the Iris used so I could just re-sell it if I didn’t notice a difference, but it’s not going anywhere.  So much for measurements being the end all be all.  And BTW, an SU6 or Holo Red is far from SOTA as DDCs go.  

My M1 Mac Mini streams for me, and also receives streams from other devices, and can output 24 bit 192 kHz over 8 channels simultaneously. My Denon receiver has dacs that can handle that signal. I've seen the measurements of the receiver and they're not state of the art by any means, but good enough that it doesn't surprise me that I don't hear any noticeable issues. I regularly have to tear myself away from the system, forcing myself to turn it off just to get necessities of life done, so it's already "too good" for my own good. On Sundays when I don't have any other responsibilities I often find my butt is getting sore from sitting all day listening to that thing. I suppose I have a more tolerant ear than the average audiophile, but interestingly I'm very aware of room and speaker issues with every system I've ever heard, the biggest most obvious issue for me being interaural crosstalk and its tonal effect on the phantom center. The fact that this obvious problem (to me) is so little discussed just goes to show that we don't all prioritize the same things when we're listening. How can you be bothered by jitter at -90 dB or more with that horrible crosstalk going on? OK, I'm exaggerating. It's a subtle but easy enough problem to hear, and one that I find annoying. We learn to mentally filter out what we can, and if we can't, we have to do something or buy something to fix it.