DAC USB Hum

It’s a shame that DACs still don’t have galvanic isolation. Meaning, there is often metal to metal through which can cause both analog and digital effects. It’s rare to see this from a streamer though, the usual culprits are PCs.

In your case you have an analog one and the fix is cheap, you need a USB isolator, though not all DACs work with them.  Usually, they don't need to be powered, but in some rare cases the DAC won't recognize the input unless there's a DC voltage so you may need to get a separate supply:

https://amzn.to/3QQM3oL

Some DACs do have galvanic isolation but they are at the higher end of the scale. One company is making DAC’s from Panzerholz  and other wood with inertial filters. I also use a USB isolator by Wyred 4 Sound. Just for extra protection. https://www.lessloss.com/echos-end-p-218.html

@jacobsdad2000 The isolation chips are so cheap, like under $2 in bulk. It's a shame.