Philips DVDR 77/00 User Manual page 29

Connecting additional devices
At the back of the DVD recorder there are two digital audio output sockets OPTICAL
AUDIO OUT for an optical cable and COAX OUT for a coaxial cable (Cinch cable).
These can be used to connect the following:
Digital multi-channel sound offers the best possible sound quality. You will
need a multi-channel A/V receiver or amplifier that supports at least one of
the audio formats of the DVD recorder (MPEG2, Dolby Digital and DTS).
Consult the operating instructions for your receiver to find out which audio
formats it supports.
a
b The receiver is not compatible with the digital audio format of the DVD
recorder. The audio format of the DVD disc is displayed in the status
window when you switch to another language. Playback in six-channel
digital surround sound is only possible if the receiver has a digital
multi-channel sound decoder.