No sound with 192kHz/24bit flac files


my equipment is:
Raspberry B with Volumio 1.4
HifiBerry Digi
2 Nubert A-200 Speakers (connected via S/PDIF electrical).

The sound is great up to 96kHz/24bit flacs.

When i play a 192kHz/24bit flac no more sound.

The Playback Tab shows me that the song is running and all the other information (… Stereo, 24 bit, 192 kHz, 4275 kbps …) .

All parts should be able to handle 192kHz/24bit recordings!

Any ideas what goes wrong?