Sound output format problem Apple TV

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Level 1

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Sound output format problem Apple TV

Hello,

I have my Apple TV output sound via LG TV to Sonos Arc. When I play a movie with Atmos the Arc correctly gets an Atmos signal and confirms this (Atmos available set on ATV). Any other sound format, e.g. Dolby Digital Plus the ATV output Multichannel PCM 7.1 and the sound is not great.

However, when I play Dolby Digital Plus movies on App from Disney+/Amazon Prime/Netflix directly on LG TV, then the format output is ALWAYS correctly transferred to the Sonos Arc and confirmed and the sound is always better.

Of course, I can force the ATV to output only Dolby Digital 5.1, but then instead I lose the Atmos output.

All formats get correcly transffered directly from LG TV (any App) to Arc.

Is there any solution or can I only use Apple TV for Atmos content or content from Apple TV+ App?

Sincerely,

Claes

Posted on Jan 23, 2023 07:51 AM

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Answer 1

Top-ranking reply

Classee Author

Level 1

6 points

Jan 25, 2023 01:11 PM in response to Urquhart1244

Hello,

Unfortunately not, I have demonstrated this for several people and the sound quality is not the same. The ATV distorts the output, instead of passing on the signal, which the LG can do without a problem. The difference is very noticeable. Obviously, the decoding should be done with the best equipment to decode, and the Arc seems far superior in that respect.

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Answer 2

Urquhart1244

Level 10

145,674 points

Jan 23, 2023 11:26 AM in response to Classee

Any other sound format, e.g. Dolby Digital Plus the ATV output Multichannel PCM 7.1 and the sound is not great.

The audio quality of PCM Multichannel is exactly the same as basic Dolby Digital (Plus), as the decoding to uncompressed is lossless. Only the display for your sound system is different (it doesn’t say DD). It works as intended.

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Answer 3

Classee Author

Level 1

6 points

Jan 26, 2023 03:51 AM in response to Classee

Hello,

A thread on the Sonos community details issues with LG TV and ATV prior to 3rd gen in great detail if anyone is interested. The sound output volume level is also explained between DD 5/7 and Multichannel on Sonos Arc, and other surround equipment.

https://en.community.sonos.com/home-theater-228993/please-read-if-you-have-encountered-issues-with-7-1-lpcm-playback-on-sonos-via-an-lg-tv-6868277

In conclusion: use ATV and be prepared to adjust the volume a lot department on the sound format, or play only Atmos content on ATV and other formats on LG. There is also possible to use the Auto format on

LG instead of Bitstream, which seems to interfere less, which is strange.

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Sound output format problem Apple TV

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