Qualcomm claims that the audio codec intergrated into its flagship mobile SoCs can rival DACs produced by dedicated manufacturers. Its latest iteration of these are found in the new Snapdragon 730 mid-range chipsets. They are called the WCD9370 and WCD9375 Aqstic codecs.
https://www.notebookcheck.net/Qualcomm-unveils-its-latest-series-of-Aqstic-audio-codecs.424300.0.html
I take it this was tested on a generic and now ubiquitous C port? Not 4.4mm balanced right?