Beam Gen 2 and Apple TV 4K

  • 9 October 2021
  • 2 replies

I’ve just upgraded to the Beam Gen 2 from the Gen  1 and have noticed that 5.1 audio from the Apple TV is coming through as Multichannel PCM 7.1. I’ve seen a few other threads on this topic but I’m not sure if this is impacting the sound quality at all? Is the Apple TV or the Beam upmixing to 7.1 and if so why? Note I haven’t got surrounds and TV is LG CX.

2 replies

Userlevel 7

See my response to this post:


So just to update this I played some 5.1 and 7.1 audio test files through the beam (airplayed to the Apple TV) and in both cases the correct channels were played (the additional surrounds for 7.1 just seem to be played exactly the same as the normal R/L surrounds) so it doesn’t seem like there is any issue with the TV pushing a 7.1 channel signal to the Beam. I had read some other threads about the LPCM signal not being down mixed correctly but that didn't seem to be the case for me.

Overall I suspect that the issue is with the CX but I’m guessing it’s a quirk of how the TV processes the signal rather than a bug but there is a firmware update due imminently for the CX so I will check again once that is available.

This general topic does seem to have been discussed online a lot, even down to a tweet from the Sonos CEO but as far as I can tell any update on the issue from Sonos seems to have stopped a few months ago so it would be good to know if this is because the issue is considered to be solved, or if there is more to come. Thanks