Sources without Poly/2Go:
- Hiby R3 DAP via coax-cable with ripped FLAC files on SD
- iPhone with Meenovy Lightning-USB cable, Qobuz or Tidal streaming (Qobuz has better SQ IMO)
- Laptop with USB cable, Tidal and Qobuz
- Macbook Pro 2014 with USB or optical out
With Poly/2Go:
- controlled by MConnect Lit on iPhone
- Sources: FLAC files on SD, Qobuz, Tidal
I found that Poly and 2Go increase detail, separation, clarity and staging in pretty much all scenarios.
My preferred music source is now Qobuz, it sounds better IMO than Tidal
Out of all non-Poly/2Go sources the Toslink from MBP was maybe best, followed by the HiBy R3 and iPhone for streaming.
These tests are admittedly difficult to do reliably, so take it with a grain of salt...