I use a $20 blue jeans belden coax cable and my SQ is good enough for me. Obviously you know more about this than I do. All I know is what I have read.
Have you tried a better cable to see if that makes a difference?
Have you tried another source, like a Sonos and compared that to your transport? Two different transports?
If there are differences in any of these, then your system will likely benefit from low jitter sources.
Steve N.
Empirical Audio

