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Anyone else experiencing the same issue? Multichannel PCM 5.1 blanks out for a second every 1-2 minutes. I don’t think it’s a bandwidth issue as it works flawlessly with Multichannel PCM 7.1 (thorough test) and Dolby TrueHD Atmos (quick test). And it may have been caused by the Sonos 14.10 update. Setup is PS5→ LG C1→ Beam 2 (via earc).

 

2 weeks ago before the 14.10 update, I watched a bluray film wherein I had my PS5 transcode the DTS-HD MA 5.1 audio to Multichannel PCM 5.1 (as the C1 does not support DTS) and had no issues. Earlier today, I played a bluray film for the first time in 2 weeks and I encountered consistent audio dropouts every 1-2 minutes. It had the same setup where DTS-HD MA 5.1 → Multichannel PCM 5.1. I tested other bluray discs including the one I watched 2 weeks ago and they all now have the same issue.

 

Curiously, I’ve been gaming heavily on my PS5 the past two 2 weeks and haven’t had any audio issues. Then I realized that I’ve been using Multichannel PCM 7.1 when gaming on my PS5. So I made some changes under the PS5 sound settings to make it output Multichannel PCM 5.1 instead. Lo and behold, I am now getting the same consistent dropouts in games and even on the PS5 main menu.

 

I think it’s due to the Sonos 14.10 update as that’s the only firmware update I’ve done in the last 2 weeks. No PS5 update, no LG C1 update. Well actually while I was composing this post, I received and applied the latest LG C1 firmware update and I still have the same issue.

Hi @throwawaybeam2 

Thanks for the diagnostic. The Beam is reporting underflow errors, meaning that the audio is being interrupted before it reaches the Beam. As this happens with two source devices, the source of the interruption is likely the TV itself, or the physical connection between the TV and the Beam.

If you haven’t done so already, please unplug the TV from power for at least 2 minutes. In the majority of cases, this simple step usually fixes such issues. I didn’t mention it before as you mentioned installing a TV software update - this would include the TV rebooting it’s software. Perhaps it’s the hardware that needs to restart instead.

If this doesn’t help, please swap the ends of the HDMI cable linking your Beam to the TV - put the end that’s currently in the TV into the Beam, and vice versa. Also, are you using the cable that was supplied with the Beam? If not, please do so. If so, please try another (HDMI 1.4 or better).

I hope this helps.

Hi @throwawaybeam2 

Please recreate the issue and submit a support diagnostic, replying here with the number given. Thanks.

Diagnostics: 1458431194

As I have no idea how Sonos gathers the data, I had my setup run for 5+ minutes where the issue appeared multiple times. I hope it’s enough.

It’s a really weird issue as I’ve tried out various Dolby and LPCM formats since updating to 14.10 and it only appears on Multichannel PCM 5.1. The only format I’ve been unable to test is Dolby MAT Multichannel.

Hi @throwawaybeam2 

Please recreate the issue and submit a support diagnostic, replying here with the number given. Thanks.

Hey @Corry P 

I checked the link and unfortunately my country is not listed on the dropdown so I can’t call and chat indicates that there are no representatives available.

 

For anyone with a PS5 who would like to test the issue out, you could do the following. No need for a bluray film / game as you could test it simply with the audio that’s playing on the background of the settings screen:

  • Go to Settings→ Sound→ Audio Output→ HDMI Device Type→ Set to “AV Amplifier”
  • Go to AV amplifier→ Number of Channels → Select among 2 ch, 5.1 ch, and 7.1 ch
  • If you select 7.1 ch or 2 ch from the dropdown on the PS5, Multichannel PCM 7.1 / Stereo PCM will be reflected on the Sonos S2 App. Listen to the background audio and there should be no issue.
  • If you select 5.1 ch from the dropdown on the PS5, Multichannel PCM 5.1 will be reflected on the Sonos S2 App. Listen to the background audio and there should be consistent audio dropouts once every 1-2 minutes.

I guess you could also test with a PC or any device where you could force toggle between Multichannel PCM 5.1 and 7.1.

Hi @throwawaybeam2 

Welcome to the Sonos Community!

As you have experimented and found this to be repeatable, I recommend you get in touch with our technical support team directly so they can take some diagnostics and gather information regarding this occurrence. Thank you. 

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