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


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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?

 

 


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OK. Is it more prominent for you also when you enable “Night Sound” ?

And just to double check - when you say “all sources”, you mean input anyway from TV (either HDMI or Optical), but all sorts of audio encodings, is that correct?

 

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OK. Is it more prominent for you also when you enable “Night Sound” ?

And just to double check - when you say “all sources”, you mean input anyway from TV (either HDMI or Optical), but all sorts of audio encodings, is that correct?

 

Haven't noticed night sound making it any worse. I get the metallic sound on all audio coming from the TV through the Beam, regardless of source or encoding. 

Yeah I tried the optical connector and it was the exact same too. 
 

I am getting the issue from all TV inputs via HDMI. Strangely if I put something on my phone and just airplay the audio to the beam it doesn’t have the same robotic reverb sound. 
 

Noticed it across all content from Atmos to stereo. It is really noticeable on the Elton John farewell show on Disney+ because of the crowd noise. Would be a good example to share with the sound engineers.

 

Hopefully they release a patch to fix it soon, but from seeing how long people have been mentioning it, maybe that’s a bit of wishful thinking. 

 

Additionally it maybe of help but I have noticed if you use speech enhancement it brings the effect down slightly and also if you use the height setting and go to minus 6 or lower it brings it down. 

Have a play with the height setting while watching a game of football in the world cup and you will notice the difference in the robotic crowd effect.

Hopefully this can help you out 👍
 

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I can confirm that playing with the “height audio” level setting changes this bogous metallic effect.
I cannot however make it go away using height audio settings … just change its “presence”.

What is especially astonishing is, that height settings also changes the metallic effect with audio that is only stereo, 2.0 (e.g. Dolby Multichannel PCM 2.0).

Astonishing as 2.0 audio does not in itself carry anything that could be directly interpreted as “height” or even ambient audio.

This again points to some advanced audio processing that is going berserk.

 

It is really strange that there are so few people realizing this or are complaining. I am on the brink of returning my beam as this effect is extremely annoying.

 

Benny, did you also have the change to check with non-LG TVs? As mentioned earlier, I had a Panasonic before which also exhibited the issue… but I guess we could use some more data-points on this one.

 

I’ve got an LG C9 OLED TV with Arc and another (older) LG TV with a Feintech VAX04101A audio extractor to provide DD+ Atmos, used with the Beam (gen2).

Both have Surrounds/Sub (gen3) and am happy to try to see if I can hear the metallic audio issue, but not sure what I’m looking for?

Are there any examples (Netflix/Amazon sources perhaps?) that you could post and state a place in the movie/show where (and what) to listen for and the settings you have in place in the Sonos HT room (just need those outside of the HT default settings). 

Always happy to try to test these things, whenever I get a chance that is - so please supply the detail and I will happily test and report back if I hear it.

I assume what you’re hearing is something ‘similar’ to Auto-Tune as used in the late 90’s by Cher on her ‘Believe’ track, but please correct me if I am perhaps misunderstanding things here.

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Hi Ken,

would be great if you could try to reproduce it.

That said, I am glad I can say that it is in no way similar to that song nor reproducible using Cher.

For a moment I was really afraid I that I would have to listen to it over and over again. ;-)

 

I think Elton John’s farewell Show on Disney+ is what Benny mentioned earlier in this conversation.

As I do not have Disney+, I cannot confirm from my end but will look for something on Amazon or NetFlix.

 

Also, I have posted a link to an actual recording of the issue here.

 

But in general, anything with a crowd in the background seems a good choice. For me the effect is most audible when enabling “night sound” in scenes with low overall volume/density and a crowd (e.g. background clapping or chatting). It is clearly coming from the two outwards pointing speakers on the Beam.


It only seems to happen with audio input from the TV.

 

Will let you know as soon as I have identified a sample to reproduce from my side.

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This clip will reproduce the sound. You can search 'Superman Game Unreal Engine' in YouTube on the TV. It was uploaded by TJATOMICA.

 

Turn the volume up and listen for the city sounds at the start of the video when the Superman character is on the ground. It sound like the city noise is out of phase or low bitrate. 

I recommend doing it with just the TVs and the beams on their own, without the sub or surrounds. A few posts online have said the issue disappears when surrounds are added. 

 

Hi Ken,

would be great if you could try to reproduce it.

That said, I am glad I can say that it is in no way similar to that song nor reproducible using Cher.

For a moment I was really afraid I that I would have to listen to it over and over again. ;-)

 

I think Elton John’s farewell Show on Disney+ is what Benny mentioned earlier in this conversation.

As I do not have Disney+, I cannot confirm from my end but will look for something on Amazon or NetFlix.

 

Also, I have posted a link to an actual recording of the issue here.

 

But in general, anything with a crowd in the background seems a good choice. For me the effect is most audible when enabling “night sound” in scenes with low overall volume/density and a crowd (e.g. background clapping or chatting). It is clearly coming from the two outwards pointing speakers on the Beam.


It only seems to happen with audio input from the TV.

 

Will let you know as soon as I have identified a sample to reproduce from my side.

 

I don’t use Disney+ either, but I haven’t noticed it whilst watching the World Cup football - would that be a good option to listen to the crowd, perhaps🤔? I’m still not exactly sure what to listen-out for, but in fairness I have been watching things here with the surrounds and Sub enabled.

I will try the posted YouTube video after the Wife has finished watching her programmes (Coronation Street etc.) but that’s going to just be in PCM stereo anyway, I assume? (does that matter?) ..and I’ll see if I notice anything. I will post back later.

Oh, and I will switch the surrounds and Sub off too and Trueplay aswell.

During the advert break, the Wife let me do a first initial test (see screenshots taken - merged) - my first reaction was just how much I would definitely miss Surrounds and even more-so the Sub audio output.

So I cast the posted YT video to my TV YouTube App and just to say this is the first test with the Sonos Arc - I will do the Beam (gen2) a little later.

I can’t say I’m noticing an issue - I switched off surrounds/sub and tried it with Trueplay on and off. (Better sound with it ‘on’ in my case).

I replayed the video (especially the beginning several times) and sounds like a recording of background traffic - I didn’t notice a metallic sound at all - I later played the video on an iPad Pro in stereo (where the screenshots were taken/merged) and that sounded similar to what I was hearing on the Arc but just not as good/loud as the Arc (obviously)

So this was just my first initial test and my initial thoughts.

Could really do with more/better examples than game-playback on YouTube perhaps?

But no metallic-like sound noticed at this point.

Similar testing done to my post above, but using the Beam (gen2) and same YT video - (screenshots attached again).

Again I did the same testing, but went the extra mile by toggling on/off ‘night-sound’ and ‘speech enhancement’ aswell as Trueplay …and even toggled off/on the surrounds and sub.

It still sounds the same to me - I just can’t even think what the metallic sound would be that you’re hearing, but I get that the background traffic/noise on that YT video is not brilliant - I tried a few other YT videos too.

So I’m not hearing/noticing the issue, or anything unusual, that would have perhaps come to my attention.

I still think some better video examples might perhaps help and again I’m happy to test those too. 

Note that YT video sounds the same/similar on my Beam as when I listen to it both on my iPad speakers or via headphones connected to the iPad. So I’m not noticing anything unusual coming from the standalone Beam.

Send me a suggestion of another video source to test - ideally Netflix, or Amazon Movies and perhaps others with a Beam will chime in here and help test these things too.

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@Shnakey : i can confirm I can reproduce the issue with the Superman YouTube video you posted.

I have to add though that while clearly noticeable, there is other material that exposes the issue more prominently. I hope I find some time myself to search for additional material.

 

@Ken : I posted a recording of the issue here in this forum. You can check what it sounds like there.

I posted the links, quoting myself (second recording of the issue):

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

http://sndup.net/vnwz

Im that recoding the issue is less prominent in second 0..5, very obvious 5..10.


I think the issue could be described also a low pitch circular saw in the background -or- a swarm of metal cicadas -or- as others said, a robot army.

Can you hear it in the recording?

 

That said, if you cannot reproduce it in your setup - it will be interesting to identify any differences in setup.

Mine is: Beam directly connected to LG TV via eARC HDMI. Lg audio configured as pass-through.

 

 

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Update: in my LG i have a setting 

Sound / Advanced Settings / Digital Sound Output

 

If I set this to „pass through“ the issue is there.
The Sonos app is showing audio to be of format: „Dolbly Multichannel PCM 2.0“.

 

if I set this to „PCM“, the issue is not/hardly noticable. Sonos app is reporting audio to be „Stereo PCM“ on this case.

 

@Ken_Griffiths: what is the audio format being reported as in the Sonos app when you do your tests?

 

 

I’ll check the audio and let you know what audio format the Sonos App shows when playing the YT Superman video. My LG TV’s are both set to ‘pass-through’, just to confirm that.

In the uploaded audio recording I can hear what was described as a circular saw, but what might have helped would have been to post a link to the actual video and to then listen to that on other devices to see how it sounds, just in case it’s a noise recorded in the source audio itself.

if there is an issue just with the Beam, I would have thought the sound mentioned would be present on a good many audio sources such as movies/shows on Netflix, or Amazon etc; and it perhaps might help if it’s able to be shown that the audio issue is only present on the Beam and not present on other playback devices belonging to other device manufacturers. As I say the Spider-Man YT video sounds the same on an iPad and headphones as my Beam, particularly when playing it back at higher volume levels.

Anyhow if there are more examples please post those too as I will happily continue to try to test things here with my Home setup.

I will report back on the audio format the App shows when I return home. I’m out and about at the moment.

Ok the audio format I’m seeing is ‘stereo PCM’ when I play the TJATOMICA YT Supernan video with the YouTube App on my TV

The above post was referring to my living room TV with the Arc.

If I play it on the Beam in the Dining Room I get ‘Dolby Digital Plus 2.0’ but both sound similar/same, as far as I can tell.

I’ve not used SndUp before, but I have uploaded a recording of what I hear from the Beam when playing the start of that YT TJATOMICA Superman video, which I just recorded using iPad Pro mic - here is the link (hope it works)…

http://sndup.net/p3fs

(extract from beginning until Superman takes off/launches).

I don’t hear a metallic sound but maybe it’s a frequency I’m not noticing. See if you hear it.

It’s probably not the best recording but at least shows what I’m listening/hearing here, which seems fine and ties in with what I hear when it’s played on the iPad too.

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Hi Ken,

i have also recorded what I hear on my Beam. Note that this recording was done in direct proximity to the sidewards pointing speakers in the beam, not in the middle of the room.

Thus the effect is very clearly audible.

find it here:

http://sndup.net/rvwz

First ten seconds - no night sound. Then after 10s, nightsound enabled - which in this case seems to not make that much of a difference.


It shows as „Dolby Multichannel PCM 2.0“ in the Sonos app.

Pretty akward that your beam reports a different audio format playing back the same video.

 

Looking at the original Video Stats, it seems audio is „Opus 251“ which translates into being stereo (2channel) VBR.

 

Also, can you confirm you directly connect the TV to Beam, 1:1 with the Beam HDMI cable?


 

Cheers,

Kai

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@Ken_Griffiths 
P.S.: I cannot hear any distortion in your recording. Maybe worth doing the recording in direct proximity to the sidewards pointing speakers again.

Hi Ken,

i have also recorded what I hear on my Beam. Note that this recording was done in direct proximity to the sidewards pointing speakers in the beam, not in the middle of the room.

Thus the effect is very clearly audible.

find it here:

http://sndup.net/rvwz

First ten seconds - no night sound. Then after 10s, nightsound enabled - which in this case seems to not make that much of a difference.


It shows as „Dolby Multichannel PCM 2.0“ in the Sonos app.

Pretty akward that your beam reports a different audio format playing back the same video.

 

Looking at the original Video Stats, it seems audio is „Opus 251“ which translates into being stereo (2channel) VBR.

 

Also, can you confirm you directly connect the TV to Beam, 1:1 with the Beam HDMI cable?


 

Cheers,

Kai

 

The recording via  the iPad Pro was done directly in the middle of the beam about 6 inches away from the front of it.. but will listen out again to the side speakers.

  • PCM stereo format to the Arc was from the LG TV’s own built in YouTube App and that TV is directly connected to the Arc (eARC connection)
  • The Dolby Digital Plus 2.0 to the Beam was from a Nvidia Shield via Feintech VAX04101A extractor which I use with that TV but the Beam uses eARC connection to that extractor too - so maybe that’s the reason for the differences in codec. (Sorry it’s the best I can do with each of the HT setups I have here, without moving the devices about, which would be a lot of hassle for me).

Maybe others here will chime in and perhaps help test this on their HT setup too, but not hearing the metallic sound so far here.

Just as a thought - Maybe it’s the codec on the sending device that’s the cause of the issue here and not the Beam hardware, perhaps 🤔?

It might help to play the same audio, using the same codec, to a different speaker, if practicable, to see if it sounds the same. I assume this only happens with a few sources rather than it being a widespread issue. Something to do with some sounds and how they are being transcoded before being sent to the Beam?

Just wondering if maybe we’re looking in the wrong place as to the cause of the issue, just because the sound is coming from the Beam, it may not be the speaker, but something happening before it gets to the speaker in the transcoding stage of the audio itself?

Can anyone else here perhaps say if this only happens whilst listening to the audio in Dolby Multichannel PCM 2.0 format, as that might help narrow things down to that codec and/or the sending device… (that’s assuming the TV is set to pass-through the audio uninterrupted)?

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Just as a thought - Maybe it’s the codec on the sending device that’s the cause of the issue here and not the Beam hardware, perhaps 🤔?

It might help to play the same audio, using the same codec, to a different speaker, if practicable, to see if it sounds the same. I assume this only happens with a few sources rather than it being a widespread issue. Something to do with some sounds and how they are being transcoded before being sent to the Beam?

Just wondering if maybe we’re looking in the wrong place as to the cause of the issue, just because the sound is coming from the Beam, it may not be the speaker, but something happening before it gets to the speaker in the transcoding stage of the audio itself?

 

@Ken_Griffiths 

“maybe its the codec on the device sending”:

yes, maybe. But on the other hand, we have peope reporting it on Sony TV / Virgin V6 Box [1] and myself I had it on a Pansonic TV (which unfortunately I have no access to anymore).

 

So I would like to second your thought, someone who can reproduce audio as “Dolby Multichannel PCM 2.0“ would be extremely helpful.

 

I understand that connecting the Beam to LG directly to reproduce is not currently possible for you, Ken, correct?

 

[1]

https://www.avforums.com/threads/beam-gen-2-disorted-metallic-sound-w-tv-earc.2429996/#post-30935186

 

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@Shnakey 

 

Can you help us out here:

  1. does the error on your end sounds similar to what I recorded (see above)?
  2. what is your TV model?
  3. What is the Sonos App showing as the audio format, at the time you reproduce the error?
  4. if you had an LG tv, is the error also going away if you disable pass-through and switch to PCM?

 

Cheers!

Just as a thought - Maybe it’s the codec on the sending device that’s the cause of the issue here and not the Beam hardware, perhaps 🤔?

It might help to play the same audio, using the same codec, to a different speaker, if practicable, to see if it sounds the same. I assume this only happens with a few sources rather than it being a widespread issue. Something to do with some sounds and how they are being transcoded before being sent to the Beam?

Just wondering if maybe we’re looking in the wrong place as to the cause of the issue, just because the sound is coming from the Beam, it may not be the speaker, but something happening before it gets to the speaker in the transcoding stage of the audio itself?

 

@Ken_Griffiths

“maybe its the codec on the device sending”:

yes, maybe. But on the other hand, we have peope reporting it on Sony TV / Virgin V6 Box [1] and myself I had it on a Pansonic TV (which unfortunately I have no access to anymore).

 

So I would like to second your thought, someone who can reproduce audio as “Dolby Multichannel PCM 2.0“ would be extremely helpful.

 

I understand that connecting the Beam to LG directly to reproduce is not currently possible for you, Ken, correct?

 

[1]

https://www.avforums.com/threads/beam-gen-2-disorted-metallic-sound-w-tv-earc.2429996/#post-30935186

 

Yes, I can connect the Beam direct to the TV, I guess, as the TV does have an HDMI-ARC port, but not eARC, that’s the reason I got the Feintech extractor to allow me to play Atmos and uncompressed Multichannel audio, as the built-in TV Apps sadly only support (upto) Dolby Digital 5.1.

My Sonos Arc is directly connected to my main TV (LG C9 OLED) over HDMI-eARC and I will keep trying to see if I can get the metallic sound to show up on there too.

I will test with the Beam directly connected to the older LG TV (2015), (but it won’t get uncompressed Multichannel PCM over HDMI-ARC, as the codec is eARC only) but will see what I can discover from that setup too.

So is the current thinking, that it ‘might’ be connected to the Multichannel PCM codec? … as I do also have an Apple TV 4HD that uses Multichannel PCM, albeit that’s connected via the C9 TV and the Sonos Arc?

Anyhow, I will keep trying and report back if I hear anything.

Some further audio sample/suggestions might perhaps help here too.

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