M20 - Q. I cannot hear any audio via optical, and the white LED is flashing is double flashing every 3 seconds?
Answer:
The LED flash pattern indicates that the optical input is receiving multichannel or Dolby Digital audio which cannot be played.
Quite often, HD (film channels in particular) send audio in
Dolby 5.1. One of the reasons that the M20s sound so good is because
they are purely stereo products. This means the product sending the
digital signal must be configured (via the set-up menu) to send a PCM
Stereo signal.
Within the audio settings of your TV, please ensure that the 'Digital Audio' setting is set to two channel stereo/PCM
and not Dolby/multi-channel. This should resolve the lack of sound, as Q Media
products are two channel only and cannot decode multi-channel
information, therefore you need to ensure all multi-channel audio is
down sampled to two channel. Please note that you may also need to
change the audio output settings for apps such as Netflix and other
devices, i.e. set-top/cable boxes, DVD and Blu-ray players and games
consoles.