When playing DSD files I here some 'clicks' in the music they don't belong there... (Knacksen)
The newest firmware is installed.
which output do you use? What kind of DSD files (64, 128, 256?)
I' am using the RCA analog output. The DSD file is an DSD 64 (.dsf) with the latest firmware
EDIT!
After all I convert the specific DSD files in the program XLD to a DFF format and the problem solved. (The problem is with the DSD files and not on the X40.)