The FiiO K11 R2R is primarily designed for use with PCs and the PlayStation 5, but there is no specific support or compatibility with the Xbox Series X mentioned.

- The devices support USB connectivity and different audio classes (UAC 1 and UAC 2), but these functions are mainly optimised for PC and PS5.
- There are no official specifications or tests that confirm compatibility with the Xbox Series X.

It is therefore unlikely that the K11 R2R will work with the Xbox Series X without further customisation or special configurations.