RE: XPS 15 96560 Audio Crackling
Got to go to work, but just wanted to say to try this to get the Windows native driver to install:
Un-install the Realtek driver in Device Manager, and check the box to delete the driver software. After re-boot, check again. If Realtek is still there, that means after Windows removed the driver, it found the files for an older version on the hard drive, and installed it. When the files for all older versions have been been removed, Windows should build the native driver. I think that should work, but if doesn't because the native driver files are really gone, you would have to install the Realtek driver again.
A lot of owners (of other models) have posted that using the native driver helps with the crackling.