Kathrein UFD 570/S - Manual (Page 27)

Sound Settings
27
AC3
The receiver can process sound transmissions in AC3 format (Dolby
Digital) providing you with the opportunity of listening to cinema sound
quality in your living room. The digital sound output is provided for this
purpose. You will need to connect it to a corresponding system.
Please refer to the instructions manual of your Dolby Digital
system.
In order to reproduce the AC3 format, set your receiver in the audio
menu under "stereo" to “1 of 2" or "2 of 2 (2 Ch)". The corresponding
transmission – "5.1 Ch" (5 channels + 1 subwoofer channel) is then
indicated at “Dig. output”.
Not many broadcasters transmit the AC3 format. If AC3 format is not
transmitted, you will only be able to select the standard stereo or
mono settings or select the broadcast language.
Mute
Press the

button on the remote control to mute the sound. This
symbol

appears on the screen.
Press the

button again to restore the sound. The standard
volume display bar is then shown for several seconds.
Although you can change the channel while in mute mode, it will
remain muted until this mode is cancelled or you correct the volume.