LG C9 + Arc + UB820 / Multichannel PCM for DTS Blu-Ray discs



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Userlevel 1
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For what its worth I dont think its 'just' the player or 'just' the TV rather the two seem incompatible when passing LPCM for some reason. 

I have C9 TV and my player (Oppo) is able to convert DTS to LPCM meaning I get LPCM7.1 or LPCM5.1 depending on DTS soundtrack used on disc. The HDMI port for TV from bluray is set to bitstream. Setting the TV to PCM results in downgrade to 2.0.

Others are stating the Panasonic player works seamlessly with other TV brands.

Userlevel 2
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Thanks for the thread.

I have a Panasonic UB820 on order from Best Buy (took advantage of the $100 off sale). Meanwhile, I have been using a LG UBK90 4k Blu-ray player with the Arc (+Sub + 2 SLs) and LG C9 55”. I can confirm that I can get multichannel PCM from a DTS track through the TV to the Arc by converting it at the Blu-Ray player. I have 18 gbps + ethernet cables connecting all components.

 

Sharing my set up to see if we can isolate the problem with the UB820. See below for ideas on testing for those with the three components in this thread. 

 

My current set up:

LG UBK90 4k player via HDMI to Input 3 of LG C9 55”. Both are on the latest firmware

Sonos Arc + Sub + SL (x2) bought in November 2020. Also on latest firmware.

 

TV settings:

Audio out: HDMI ARC

eARC enabled

Passthrough Audio

 

 

From the UBK90 for DTS-MA discs

Audio Output set to PCM. I think that is the only setting that impacts this.

When I play a DTS 1.0 (mono) disc, I get PCM 3 Channel reported on the Arc. (Presumably, the converter in the 4k player is sending silence to the L&R and passing the 1.0 channel to the center.)

With DTS 2.0, I get PCM 2.0

With DTS 5.0, I get PCM 5.0

With DTS 5.1, I get PCM 5.1

 

I do not have a DTS X disc to try, so nothing to report there.

 

If I leave the UBK90 in Bitstream mode, I get no audio at all. (This makes sense since the Sonos at the end of the chain cannot process DTS. I thought if the TV were in Auto HDMI Arc out, it might handle decoding and re-encoding, but no luck on that.)

 

If I want to play a Dolby Atmos track from a 4K disc, then I have to put the UBK40 back into Bitstream mode. There is no separate option for Dolby and DTS handling on this player as there is on the Panasonic higher end models. If I don’t do this, I get a PCM 2.0 track which is probably the UBK taking the back up 2.0 channel that I think is in most Atmos mixes. Not sure. So, the annoyance is having to remember to swap settings on the UBK if I change discs. Dolby Digital 5.1 will decoded to PCM if in that mode or will pass through to the Sonos if I am in bitstream mode.

 

However, everything else is working as I would expect - I can get all the channels delivered to the Sonos from the source media. They sound correct to my ears during playback. So, if there is a handshake issue with the Panasonic, it is not a general failure - it is a specific one.

 

I can also report that AppleTV and my Tivo are all producing the right amount of audio as I would expect on the Sonos Arc via the LG C9. Atmos works and everything else is correct in terms of channels.

 

Back to the question of this thread and wondering if this configuration has been tested:

Using the Audio only HDMI output, directly connect the Panasonic to the Sonos. Use the first HDMI for the video to the LG C9. From there, adjust the output settings on on the Panasonic for DTS to mix down and for Dolby to passthrough to the 2nd HDMI port. TV can be in TV speaker mode (and should not get any audio anyway). 

 

I know this is not a good end state (since there would be no way to easily include other components), but it would at least determine if the Arc and Panasonic can hand off the multichannel PCM audio correctly. This may still mean that the LG or the Panasonic is at fault for the handshake error, but at least it would eliminate the Sonos.

 

I will try this if no one else gets a chance to. (My Panasonic is due in a week.)

 

Laird

 

The Arc isn’t the problem. I don’t even think the UB820 is the problem. I have the UB820 and I get multichannel PCM playing through my Arc. There is a specific handshake issue between the LG and UB820 and I believe the problem needs to be addressed by LG.

Am I correct in saying you have a C9 not a CX?

Userlevel 2
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I tried connecting the arc directly to the audio out HDMI terminal on the UB820 and the arc just kept flashing orange and white trying to establish a connection 

 

The Sonos app reported no audio at all 

Userlevel 3
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Thanks for the thread.

I have a Panasonic UB820 on order from Best Buy (took advantage of the $100 off sale). Meanwhile, I have been using a LG UBK90 4k Blu-ray player with the Arc (+Sub + 2 SLs) and LG C9 55”. I can confirm that I can get multichannel PCM from a DTS track through the TV to the Arc by converting it at the Blu-Ray player. I have 18 gbps + ethernet cables connecting all components.

 

Sharing my set up to see if we can isolate the problem with the UB820. See below for ideas on testing for those with the three components in this thread. 

 

My current set up:

LG UBK90 4k player via HDMI to Input 3 of LG C9 55”. Both are on the latest firmware

Sonos Arc + Sub + SL (x2) bought in November 2020. Also on latest firmware.

 

TV settings:

Audio out: HDMI ARC

eARC enabled

Passthrough Audio

 

 

From the UBK90 for DTS-MA discs

Audio Output set to PCM. I think that is the only setting that impacts this.

When I play a DTS 1.0 (mono) disc, I get PCM 3 Channel reported on the Arc. (Presumably, the converter in the 4k player is sending silence to the L&R and passing the 1.0 channel to the center.)

With DTS 2.0, I get PCM 2.0

With DTS 5.0, I get PCM 5.0

With DTS 5.1, I get PCM 5.1

 

I do not have a DTS X disc to try, so nothing to report there.

 

If I leave the UBK90 in Bitstream mode, I get no audio at all. (This makes sense since the Sonos at the end of the chain cannot process DTS. I thought if the TV were in Auto HDMI Arc out, it might handle decoding and re-encoding, but no luck on that.)

 

If I want to play a Dolby Atmos track from a 4K disc, then I have to put the UBK40 back into Bitstream mode. There is no separate option for Dolby and DTS handling on this player as there is on the Panasonic higher end models. If I don’t do this, I get a PCM 2.0 track which is probably the UBK taking the back up 2.0 channel that I think is in most Atmos mixes. Not sure. So, the annoyance is having to remember to swap settings on the UBK if I change discs. Dolby Digital 5.1 will decoded to PCM if in that mode or will pass through to the Sonos if I am in bitstream mode.

 

However, everything else is working as I would expect - I can get all the channels delivered to the Sonos from the source media. They sound correct to my ears during playback. So, if there is a handshake issue with the Panasonic, it is not a general failure - it is a specific one.

 

I can also report that AppleTV and my Tivo are all producing the right amount of audio as I would expect on the Sonos Arc via the LG C9. Atmos works and everything else is correct in terms of channels.

 

Back to the question of this thread and wondering if this configuration has been tested:

Using the Audio only HDMI output, directly connect the Panasonic to the Sonos. Use the first HDMI for the video to the LG C9. From there, adjust the output settings on on the Panasonic for DTS to mix down and for Dolby to passthrough to the 2nd HDMI port. TV can be in TV speaker mode (and should not get any audio anyway). 

 

I know this is not a good end state (since there would be no way to easily include other components), but it would at least determine if the Arc and Panasonic can hand off the multichannel PCM audio correctly. This may still mean that the LG or the Panasonic is at fault for the handshake error, but at least it would eliminate the Sonos.

 

I will try this if no one else gets a chance to. (My Panasonic is due in a week.)

 

Laird

 

The Arc isn’t the problem. I don’t even think the UB820 is the problem. I have the UB820 and I get multichannel PCM playing through my Arc. There is a specific handshake issue between the LG and UB820 and I believe the problem needs to be addressed by LG.

Ok cool. Glad you were able to check that. Here’s hoping some sort of update comes along from LG. 

 

I did realize that Psycho 4K has a DTS:X 5.1 new mix (in addition to the now included mono mix), and I have the replacement disc on hand. On the set up described above with the LG player, I can report that with the LG in PCM mode, it passes a multichannel 7.1 to the Sonos (although I think it is only 5.1). 

Userlevel 7

Thanks for the thread.

I have a Panasonic UB820 on order from Best Buy (took advantage of the $100 off sale). Meanwhile, I have been using a LG UBK90 4k Blu-ray player with the Arc (+Sub + 2 SLs) and LG C9 55”. I can confirm that I can get multichannel PCM from a DTS track through the TV to the Arc by converting it at the Blu-Ray player. I have 18 gbps + ethernet cables connecting all components.

 

Sharing my set up to see if we can isolate the problem with the UB820. See below for ideas on testing for those with the three components in this thread. 

 

My current set up:

LG UBK90 4k player via HDMI to Input 3 of LG C9 55”. Both are on the latest firmware

Sonos Arc + Sub + SL (x2) bought in November 2020. Also on latest firmware.

 

TV settings:

Audio out: HDMI ARC

eARC enabled

Passthrough Audio

 

 

From the UBK90 for DTS-MA discs

Audio Output set to PCM. I think that is the only setting that impacts this.

When I play a DTS 1.0 (mono) disc, I get PCM 3 Channel reported on the Arc. (Presumably, the converter in the 4k player is sending silence to the L&R and passing the 1.0 channel to the center.)

With DTS 2.0, I get PCM 2.0

With DTS 5.0, I get PCM 5.0

With DTS 5.1, I get PCM 5.1

 

I do not have a DTS X disc to try, so nothing to report there.

 

If I leave the UBK90 in Bitstream mode, I get no audio at all. (This makes sense since the Sonos at the end of the chain cannot process DTS. I thought if the TV were in Auto HDMI Arc out, it might handle decoding and re-encoding, but no luck on that.)

 

If I want to play a Dolby Atmos track from a 4K disc, then I have to put the UBK40 back into Bitstream mode. There is no separate option for Dolby and DTS handling on this player as there is on the Panasonic higher end models. If I don’t do this, I get a PCM 2.0 track which is probably the UBK taking the back up 2.0 channel that I think is in most Atmos mixes. Not sure. So, the annoyance is having to remember to swap settings on the UBK if I change discs. Dolby Digital 5.1 will decoded to PCM if in that mode or will pass through to the Sonos if I am in bitstream mode.

 

However, everything else is working as I would expect - I can get all the channels delivered to the Sonos from the source media. They sound correct to my ears during playback. So, if there is a handshake issue with the Panasonic, it is not a general failure - it is a specific one.

 

I can also report that AppleTV and my Tivo are all producing the right amount of audio as I would expect on the Sonos Arc via the LG C9. Atmos works and everything else is correct in terms of channels.

 

Back to the question of this thread and wondering if this configuration has been tested:

Using the Audio only HDMI output, directly connect the Panasonic to the Sonos. Use the first HDMI for the video to the LG C9. From there, adjust the output settings on on the Panasonic for DTS to mix down and for Dolby to passthrough to the 2nd HDMI port. TV can be in TV speaker mode (and should not get any audio anyway). 

 

I know this is not a good end state (since there would be no way to easily include other components), but it would at least determine if the Arc and Panasonic can hand off the multichannel PCM audio correctly. This may still mean that the LG or the Panasonic is at fault for the handshake error, but at least it would eliminate the Sonos.

 

I will try this if no one else gets a chance to. (My Panasonic is due in a week.)

 

Laird

 

The Arc isn’t the problem. I don’t even think the UB820 is the problem. I have the UB820 and I get multichannel PCM playing through my Arc. There is a specific handshake issue between the LG and UB820 and I believe the problem needs to be addressed by LG.

Userlevel 3
Badge +2

Thanks for the thread.

I have a Panasonic UB820 on order from Best Buy (took advantage of the $100 off sale). Meanwhile, I have been using a LG UBK90 4k Blu-ray player with the Arc (+Sub + 2 SLs) and LG C9 55”. I can confirm that I can get multichannel PCM from a DTS track through the TV to the Arc by converting it at the Blu-Ray player. I have 18 gbps + ethernet cables connecting all components.

 

Sharing my set up to see if we can isolate the problem with the UB820. See below for ideas on testing for those with the three components in this thread. 

 

My current set up:

LG UBK90 4k player via HDMI to Input 3 of LG C9 55”. Both are on the latest firmware

Sonos Arc + Sub + SL (x2) bought in November 2020. Also on latest firmware.

 

TV settings:

Audio out: HDMI ARC

eARC enabled

Passthrough Audio

 

 

From the UBK90 for DTS-MA discs

Audio Output set to PCM. I think that is the only setting that impacts this.

When I play a DTS 1.0 (mono) disc, I get PCM 3 Channel reported on the Arc. (Presumably, the converter in the 4k player is sending silence to the L&R and passing the 1.0 channel to the center.)

With DTS 2.0, I get PCM 2.0

With DTS 5.0, I get PCM 5.0

With DTS 5.1, I get PCM 5.1

 

I do not have a DTS X disc to try, so nothing to report there.

 

If I leave the UBK90 in Bitstream mode, I get no audio at all. (This makes sense since the Sonos at the end of the chain cannot process DTS. I thought if the TV were in Auto HDMI Arc out, it might handle decoding and re-encoding, but no luck on that.)

 

If I want to play a Dolby Atmos track from a 4K disc, then I have to put the UBK40 back into Bitstream mode. There is no separate option for Dolby and DTS handling on this player as there is on the Panasonic higher end models. If I don’t do this, I get a PCM 2.0 track which is probably the UBK taking the back up 2.0 channel that I think is in most Atmos mixes. Not sure. So, the annoyance is having to remember to swap settings on the UBK if I change discs. Dolby Digital 5.1 will decoded to PCM if in that mode or will pass through to the Sonos if I am in bitstream mode.

 

However, everything else is working as I would expect - I can get all the channels delivered to the Sonos from the source media. They sound correct to my ears during playback. So, if there is a handshake issue with the Panasonic, it is not a general failure - it is a specific one.

 

I can also report that AppleTV and my Tivo are all producing the right amount of audio as I would expect on the Sonos Arc via the LG C9. Atmos works and everything else is correct in terms of channels.

 

Back to the question of this thread and wondering if this configuration has been tested:

Using the Audio only HDMI output, directly connect the Panasonic to the Sonos. Use the first HDMI for the video to the LG C9. From there, adjust the output settings on on the Panasonic for DTS to mix down and for Dolby to passthrough to the 2nd HDMI port. TV can be in TV speaker mode (and should not get any audio anyway). 

 

I know this is not a good end state (since there would be no way to easily include other components), but it would at least determine if the Arc and Panasonic can hand off the multichannel PCM audio correctly. This may still mean that the LG or the Panasonic is at fault for the handshake error, but at least it would eliminate the Sonos.

 

I will try this if no one else gets a chance to. (My Panasonic is due in a week.)

 

Laird

 

 

 

 

 

Userlevel 2
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Do you think it’s normal that if you have the Ub820 set to both bitstream or PCM when you press the playback info screen it still shows PCM 2 ch regardless? 
 

 

I was hoping the latest 03.21.09 update for the TV would alleviate this problem but it hasn’t so back to square one. Ridiculous 

This is exactly what I see playing 2001: A Space Odyssey.

it’s funny though first putting the disc in it, there’s Dolby Atmos just for the Warner Bros. logo and then when you play the movie, it’s as above. Gutted.

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still no difference when changing either of the above. I think I’m just going to wait until the new LG FW comes out now as there is no reason why this shouldn’t be working

 

i just played the disk on my Xbox series x and can get whatever audio format I want (was even displaying Atmos at one point on my “about my system” screen which I thought was a bit odd)

Userlevel 7

Here are my settings - would a 2.1 cable be required for this? That’s the only thing  pretty sure I don’t have 

 

TV sound settings:

DTV audio setting: Auto (options are MPEG, Dolby Digital, Dolby Digital Plus, HE-AAC and Auto)

 

HDMI input audio format: Bitstream (other option is PCM)

 

Digital sound out: Passthrough (options are PCM, Auto or passthrough)

 

eArc enabled 

 

TV Device connection settings:

Auto device detection enabled 

SIMPLINK (HDMI-CEC) enabled 

Auto Power Sync enabled 

 

UB820 settings 

Dolby audio Bitstream

DTS/DTS-HD PCM

MPEG audio PCM

BD-Video Secondary Audio Off

 

Downmix surround encoded

 

Settings for high clarity sound both outputs are set to automatic 

 

 

I don’t know if a 2.1 cable would make a difference, but it wouldn’t hurt to try.

 

For High Clarity Sound, I have both set to HDMI Only.

 

I would also try changing the Digital Sound Out on your TV to Auto or PCM and see if that makes a difference.

Userlevel 2
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Here are my settings - would a 2.1 cable be required for this? That’s the only thing  pretty sure I don’t have 

 

TV sound settings:

DTV audio setting: Auto (options are MPEG, Dolby Digital, Dolby Digital Plus, HE-AAC and Auto)

 

HDMI input audio format: Bitstream (other option is PCM)

 

Digital sound out: Passthrough (options are PCM, Auto or passthrough)

 

eArc enabled 

 

TV Device connection settings:

Auto device detection enabled 

SIMPLINK (HDMI-CEC) enabled 

Auto Power Sync enabled 

 

UB820 settings 

Dolby audio Bitstream

DTS/DTS-HD PCM

MPEG audio PCM

BD-Video Secondary Audio Off

 

Downmix surround encoded

 

Settings for high clarity sound both outputs are set to automatic 

 

 

Userlevel 7

I spoke to Sonos support this morning and they think LG is to blame, pointing me to this article

 

LG CX DTS Incompatability

If the UB820 is set to convert the DTS audio to PCM before it passes through the LG to the Arc, then the DTS incompatibility issue with the LG TV shouldn’t be an issue.


That’s what I was thinking. Whole point of setting UB820 to PCM was to get round DTS incompatibility with LG and Sonos.

Problem seems to be either UB820 not able to send full 5.1/7.1 channels as PCM, or it’s detecting something with LG HDMI connection and defaulting to 2.0

The UB820 can send 5.1/7.1 channel PCM. It’s more than likely a handshake issue with the LG and UB820 or the LG and the Arc.

Userlevel 2
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Should be possible according to this link

I spoke to Sonos support this morning and they think LG is to blame, pointing me to this article

 

LG CX DTS Incompatability

If the UB820 is set to convert the DTS audio to PCM before it passes through the LG to the Arc, then the DTS incompatibility issue with the LG TV shouldn’t be an issue.


That’s what I was thinking. Whole point of setting UB820 to PCM was to get round DTS incompatibility with LG and Sonos.

Problem seems to be either UB820 not able to send full 5.1/7.1 channels as PCM, or it’s detecting something with LG HDMI connection and defaulting to 2.0

Userlevel 7

I spoke to Sonos support this morning and they think LG is to blame, pointing me to this article

 

LG CX DTS Incompatability

If the UB820 is set to convert the DTS audio to PCM before it passes through the LG to the Arc, then the DTS incompatibility problem with the LG TV shouldn’t be an issue.

Userlevel 4
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I spoke to Sonos support this morning and they think LG is to blame, pointing me to this article

 

LG CX DTS Incompatability

 

 

Wouldn't be surprised. Everyone is looking to streaming which has pretty much become Dolby ? Sony is still  supporting DTS I believe.

Userlevel 2
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I spoke to Sonos support this morning and they think LG is to blame, pointing me to this article

 

LG CX DTS Incompatability

Thinking out loud - if people are getting multi channel LPCM using Switch/PS4 etc with the C9 and Arc, then doesn’t that mean the issue must be with UB820 or the type of PCM the UN820 is sending out?

 

If I get the chance I will try this using a Samsung tv in the other room. I think it has ARC (not eARC) but hoping I’ll at least be able to see if UB820 is sending 5.1 PCM or if it’s still 2.0

Userlevel 2
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I have a Sonos Arc and UB820, and I get multi-channel LPCM audio playing through my Arc from ALL of my DTS-HD Master Audio Blu-ray discs. More than likely, the problem is your TV, HDMI cable, or TV settings.

Thanks for all your suggestions! I have a LG CX, so therefore cannot be the TV! HDMI cable has never produced any issues so i don’t think its that either so it HAS to be something relating to the settings.

 

Panasonic settings:

All audio settings are set to Bitstream with the exception of DTS which is set to PCM as you suggest. Secondary audio is turned off. I also have surround sound encoded or whatever it is enabled, i presume this is correct?

 

TV settings:

Output HDMI ARC (Automatic)

Digital Sound: Passthrough 

eARC: On

Userlevel 1

I have the same issue.

I have the LG C9

Got the Arc last week

and got the UB820 today.

Have tried everything but can only get PCM 2.0 output.

UB20 set to output DTS as PCM

TV HDMI is set to Bitstream (tried PCM too); Sound output is set to eArc and pass through.

 

I’m not an expert at this but reading elsewhere I understand, the Arc needs to be able to receive a LPCM signal for multi channel surround, as opposed to PCM (which is 2.0 channel only?)

Can the UB820 definitely do multi channel LPCM?

There is a difference between PCM and LPCM, but both can carry 5.1 or 7.1 channels. Since GuitarSuperstar is getting PCM 5.1 or 7.1 from the UB820 as described above, then it sounds like a handshaking issue to me since the only difference between our set-ups and settings is the HD Fury Arcana...

I have the same issue.

I have the LG C9

Got the Arc last week

and got the UB820 today.

Have tried everything but can only get PCM 2.0 output.

UB20 set to output DTS as PCM

TV HDMI is set to Bitstream (tried PCM too); Sound output is set to eArc and pass through.

 

I’m not an expert at this but reading elsewhere I understand, the Arc needs to be able to receive a LPCM signal for multi channel surround, as opposed to PCM (which is 2.0 channel only?)

Can the UB820 definitely do multi channel LPCM?

Userlevel 7

I have a Sonos Arc and UB820, and I get multi-channel LPCM audio playing through my Arc from ALL of my DTS-HD Master Audio Blu-ray discs. More than likely, the problem is your TV, HDMI cable, or TV settings.

So far you are the only person who seems to have this working properly. Which TV make/model are you running? Would you mind sharing your exact settings on the UB820 and your TV?

I have a seven-year-old Panasonic ST60 plasma with HDMI ARC only. So I added the HD Fury Arcana device between my TV and the Arc that acts as an eARC connection.

Digital Audio Output settings on the UB820:

  • Dolby Audio: Bitstream
  • DTS/DTS-HD: PCM
  • Secondary Audio: Off

Yep, we’ve all got DTS/DTS-HD set to “PCM” and Secondary Audio set to “Off”. Still PCM 2.0. Sounds to me like the HD Fury Arcana is doing a better job with the handshakes, because the same settings on the UB820 are not working properly with the C9 via eARC. Have you been able to get multichannel PCM for any discs encoded DTS:X?

I just tested my Ex Machina Blu-ray and set the audio to DTS:X. The Sonos app says Multichannel PCM 7.1 and the UB820 says PCM 7.1.

Userlevel 1

I have a Sonos Arc and UB820, and I get multi-channel LPCM audio playing through my Arc from ALL of my DTS-HD Master Audio Blu-ray discs. More than likely, the problem is your TV, HDMI cable, or TV settings.

So far you are the only person who seems to have this working properly. Which TV make/model are you running? Would you mind sharing your exact settings on the UB820 and your TV?

I have a seven-year-old Panasonic ST60 plasma with HDMI ARC only. So I added the HD Fury Arcana device between my TV and the Arc that acts as an eARC connection.

Digital Audio Output settings on the UB820:

  • Dolby Audio: Bitstream
  • DTS/DTS-HD: PCM
  • Secondary Audio: Off

Yep, we’ve all got DTS/DTS-HD set to “PCM” and Secondary Audio set to “Off”. Still PCM 2.0. Sounds to me like the HD Fury Arcana is doing a better job with the handshakes, because the same settings on the UB820 are not working properly with the C9 via eARC. Have you been able to get multichannel PCM for any discs encoded DTS:X?

Userlevel 7

I have a Sonos Arc and UB820, and I get multi-channel LPCM audio playing through my Arc from ALL of my DTS-HD Master Audio Blu-ray discs. More than likely, the problem is your TV, HDMI cable, or TV settings.

So far you are the only person who seems to have this working properly. Which TV make/model are you running? Would you mind sharing your exact settings on the UB820 and your TV?

I have a seven-year-old Panasonic ST60 plasma with HDMI ARC only. So I added the HD Fury Arcana device between my TV and the Arc that acts as an eARC connection.

Digital Audio Output settings on the UB820:

  • Dolby Audio: Bitstream
  • DTS/DTS-HD: PCM
  • Secondary Audio: Off
Userlevel 1

I have a Sonos Arc and UB820, and I get multi-channel LPCM audio playing through my Arc from ALL of my DTS-HD Master Audio Blu-ray discs. More than likely, the problem is your TV, HDMI cable, or TV settings.

So far you are the only person who seems to have this working properly. Which TV make/model are you running? Would you mind sharing your exact settings on the UB820 and your TV?

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