Beam (Gen 2) disorted / metallic sound w/ TV (eARC) and Night Sound Mode

  • 1 July 2022
  • 9 replies
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  • Contributor I
  • 4 replies

Similar to what is outlined here:

 

I experience in some cases a metallic / distorted / chirping sound on my Beam2. Happens with Panasonic and LG TV, so it’s not a TV issue.

The metallic sound is somewhat in the background, but clearly noticeable. It is also somewhat correlated to the original sound, seems to be directly „derived“ from it, like a distorted low volume copy.

For me only happens in night sound mode.

When i disable night sound, the issue disappears my.

Seem to happen more often on TV channels with PCM stereo. But I have not been able to relay reliably reproduce it. It happens quite often though.

Switching the channel can make the error appear or go away.

Wild engineering guess is some sort of Bitstream MSB/LSB alignment error. Re-init also means re-align and this can fix it. Possibly hardware not SW?

Anyone else experiencing this?

 

 


9 replies

I would perhaps try to capture the sound in a mobile video recording and also submit a diagnostic report when you next encounter the issue. Note the diagnostic reference and then call/chat to Sonos Support Staff via this LINK and see what they may recommend/suggest.

I’ve got the Beam (gen2) here in our Dining Room, but can’t say I’ve ever come across the issue. Maybe try it either with another TV, if you are in a position to do that easily, or perhaps just try a different HDMI cable to try to see if that may eliminate the issue.

Anyhow, I hope you can get the matter resolved.

I’m getting the same issue. Connection wise I’m going from beam>HDMI>Opitcal adapter>tv. Not sure if that’s the root of the problem. Going to try HDMI arc with a different tv tomorrow (the one I’m using now doesn’t have arc input)

I'm experiencing this too. Beam Gen 2, via EARC on HD Arcana. I was using it last night with no issue and noticed the metallic distortion in the background. It while watching BBC1 News this evening.

It seemed to disappear after switching the TV (Panasonic) off and on, along with the V6 box. 

I'm experiencing this too. Beam Gen 2, via EARC on HD Arcana. I was using it last night with no issue and noticed the metallic distortion in the background. It while watching BBC1 News this evening.

It seemed to disappear after switching the TV (Panasonic) off and on, along with the V6 box. 

Perhaps see the first paragraph in my earlier post, just in case you do encounter the issue again.

I have done some more analysis.

For me it seems to be best (only?) reproducible using

  • Night Sound mode “ON”
  • a TV channel that sends PCM 2.0 format (never reproduced it with e.g. 5.1 or Athmos)
  • preferrably a TV program with an audio track that has no background music (which is covering the phenomenon)

I have an audio recording [1] of the phenomenon. Sadly it is not as clearly noticable on the recording as it is IRL. I suspec the mobile phone noise cancellation is getting in my way. Nevertheless. The first 20s of the audio you can head a metallic sound in the background, sound a bit like metallic rain, then after second 20 I disabled night sound (leaving the TV on the same channel) and the effect did go away.

On that channel I was able to reliable reproduce it. I did:

change TV channel back and forth → Issue always reappeared on this specific TV channel

Power cycling sonos → still there

Disable Night Sound → issue not noticable / not there

Re-enable Night Sound → Issue there again.

 

Issue exists with Panasonic and LG TV, so I assume its not the TVs fault.

 

[1]

https://file.io/uETDsjjaaXwP

I have done some more analysis.

For me it seems to be best (only?) reproducible using

  • Night Sound mode “ON”
  • a TV channel that sends PCM 2.0 format (never reproduced it with e.g. 5.1 or Athmos)
  • preferrably a TV program with an audio track that has no background music (which is covering the phenomenon)

I have an audio recording [1] of the phenomenon. Sadly it is not as clearly noticable on the recording as it is IRL. I suspec the mobile phone noise cancellation is getting in my way. Nevertheless. The first 20s of the audio you can head a metallic sound in the background, sound a bit like metallic rain, then after second 20 I disabled night sound (leaving the TV on the same channel) and the effect did go away.

On that channel I was able to reliable reproduce it. I did:

change TV channel back and forth → Issue always reappeared on this specific TV channel

Power cycling sonos → still there

Disable Night Sound → issue not noticable / not there

Re-enable Night Sound → Issue there again.

 

Issue exists with Panasonic and LG TV, so I assume its not the TVs fault.

 

[1]

https://file.io/uETDsjjaaXwP

The link says ‘file has been deleted’ FYI.

Re-uploaded here:

http://sndup.net/bd4b

 

 

I have again reproduced the issue today on a TV channel with Dobly Digital Plus 2.0.

Audio coming via HDMI. TV again the LG OLED. All firmware updated to the latest available (14.14, S2, Build 69132100). HW Version of the beam: 1.35.1.6-2.1.

 

NEW:

I can clearly locate the sound as coming primiarily from the leftmost and rightmost speakers (pointing outwards, on the both curved ends of the beam).

 

Diagnostics sent as 281087345.

I have captured it very clearly on the sidewards pointing speaker this time:

http://sndup.net/vnwz

 

This capture is:

0-5s, Night sound off → no/very little distortion

5-10s, Night sound on → Distortion clearly audible

10-15s, Nigh sound off → no or very little distortion

15-20s, Night sound on → Distortion clearly audible

20-35s, switching TV to other channels (non stereo) → no or very little distortion

35-30s, back to Dolby Digital Plus 2.0 channel → Distortion clearly audible

 

 

P.S.: I think it is also audible with Night sound disabled, but much less prominent.
I would say the recording also features the distortion in e.g. seconds 0-5 of the uploaded snippet.

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