Replying to Kuschelmonschter:
If you changed the Sony from Dolby passthrough to PCM stereo and your TV input is HDMI the TV isn't decoding Dolby and converting it to stereo. What happens is that the TV (in that mode) requests stereo from the HDMI source during the EDID session (like plug an play for computers) and stereo is the only audio that source device will place in the HDMI stream.
It is great Sony offers Dolby passthrough which allows it to tell an HDMI source to send Dolby 5.1 after which it turns off all internal audio circuits and simply passes the Dolby compressed surround signals to the s/pdif output (or arc which is essentailly the same). Most TV's (Samsung, Vizio, etc.) do not offer Dolby passthrough so if connected via HDMI you can never get Dolby 5.1 sound because it won't be in the HDMI signal after the TV requests stereo.
So SOny is superior in that (Dolby 5.1 respect) but unfortunately Sony (at least all Sony's I;ve seen) chooses to delay the audio to their internal speakers as well as their s/pdif oputput to compensate for the video delay (probably 60 to 80 ms would be my estimate) and not give users an option to turn that delay off or set it to zero.
That's fine normally since most signals arrive with additional vdeo delay but in cases where the signals arrive with audio delay already there or another device (like a Sonos, etc) delays the audio it creates too much audio delay that you cannot compensate for by adding more audio delay.
The best soultion is to take the s/pdif signals directly from your sources.to your sound system and not use the s/pdif output of your TV. That solves the video delay imposed by going through the TV as well as the loss of Dolby 5.1 for other TV's that won't accept Dolby passthrough. Of course HDMI will still take video to the TV.
The product I use is basically a 4 input s/pdif switch which delays the selected output by remote control.
.
