Possible cause 1: The CINEBAR 52 THX has several inputs. Possibly an input was set, which is not active.
Solution: Select the input through which you want to play.
Possible Cause 2: The CINEBAR 52 TX has a mute function. Possibly this is active.
Solution: Deactivate the mute function.
Possible cause 3: Is the volume set to "0"?
Solution: Increase the volume.