I have also been using a modified Wyred for sound Sonos connect for the past few months with an external DAC. There is no comparison between the stock Sonos connect digital output and the modified Sonos connect digital output, the modified digital output is much better and smoother.
I would say the modified sonos digital output is on par with my excellent dedicated cd transport which I thought would not be possible so I've been streaming tidal much more frequently through the modified connect than listening to CDs these days.
The only downside is the sonos connect does not stream high resolution files which is fine with me as I only needed it for Tidal streaming and am not interested in high resolution files.