Sony TV won't use it's own speakers when Arc Ultra is connected

CEC also carries volume information between the TV and Sonos. Here is what CEC contains, per Wikipedia . 

Exactly what kind of Sony TV do you have?  I’m experiencing the same problem on my Samsung QN90A.  And I found posts with people having the same problem with their LG TV’s as well. 

It is unbelievable that Sonos cannot be bothered to fix this problem, whatever the solution requires - either fix their implementation of the protocol or provide a workaround (perhaps a configuration options) for the way the CEC is implemented on some??! or all the TV’s.   Why should I disable CEC and sacrifice the features it provides, such as volume control?  

Why can Sennheiser and Samsung do it and Sonos cannot?  I want to be able to route the sound to the whatever device I would like to, from the TV menu, as intended, be it Sonos, internal speakers or the headphones connected to TV.

I have the same issue. A call to support blamed the Sony TV. I think it’s more like the Sonos implementation of CEC as other soundbars don’t have the issue. I’ll add a cheap Visio to the list of soundbars that don’t have an issue switching to internal speakers. I would expect better from Sonos after paying top dollar for it.

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Check the specifications for CEC. Last I looked, there was only one audio ‘sink’ allowed. Other soundbars may have gotten around this by not using CEC, and/or connecting via optical, which of course has no CEC by definition. 

First let me say that I don’t understand the reason why this thread was started:

The purpose of a soundbar is to negate using the tiny internal speakers of a TV for better audio.

When attaching a soundbar you go into the TV’s sound/audio menu and tell it to use: *

• Optical Out
• HDMI ARC Out
• HDMI eARC Out

The latter will also require enabling the TV’s flavor of CEC; as there is no standardized implementation codec. If you want to switch back to internal speakers, you’ll have to go into the sound/audio menu and select them.

Once the soundbar is installed I see no reason to switch back to internal speakers. The problem for me would be the TV auto-switching back to internal speakers. 

BTW, Sonos doesn’t implement CEC, that’s a function of the TV.  It varies by manufacturer as stated earlier.

Here’s a brief explanation of CEC implementation. Read the full article at this link.

• How Can I Tell If My TV Has HDMI-CEC?

• The majority of televisions manufactured today support HDMI-CEC, as do the majority of devices you might attach to your TV, like media receivers, soundbars, Blu-ray players, streaming devices, game consoles, and more.
• Despite the near ubiquity of HDMI-CEC at this point, you often won't see "HDMI-CEC" printed on a specifications list. Although HDMI-CEC has been part of the HDMI standard for years and has a perfectly fine name, nearly every manufacturer insists on using a branded "trade name" for HDMI-CEC instead. This is very similar to the way manufacturers have implemented Miracast, but given it a special name instead.
• It's pretty annoying, and they only do it because it pushes consumers toward purchasing items that appear to work together because of shared branding. For instance, if you're shopping for a new TV and you see a Sony TV labeled as "Bravia Sync compatible" and a Blu-ray player also labeled as "Bravia Sync compatible," you might be inclined to buy those two devices thinking they work together using some specialty Sony feature — when in reality that's just Sony's in-house name for HDMI-CEC.

In conclusion maybe I’m missing something in these complaints. I’m really trying to determine their legitimacy as a Sonos issue.🤔

 * Be very surprised if anyone is still using a TV with RCA audio-out-to a compatible RCA-input soundbar. Provided still exists.

The cheap Visio soundbar I used to have did not have HDMI-ARC tech, it was just an HDMI pass through.  The TV was not aware of any connected soundbar, and could therefore play at a separate volume.  The soundbar could not play audio from smartapps on the TV though.

We keep going in circles.  If Sennheiser (AMBEO Soundbar Plus) can do it (notwithstanding Samsung HW-Q990D, albeit it was Samsung paired with Samsung), then Sonos should be able to.  Again, there is no normal proper scenario where a soundbar should be stealing the ability to switch to whatever output the user prefers on their TV, be it internal speakers or headphones!! selected in the TV menu.  If Sonos is incapable of accommodating this, they should have an off/on functionality to shut the soundbar down per user preference. 

Nobody is adding a TV to their soundbar.  It is the soundbar being added to the TV and the manufacturer of the soundbar should be doing whatever is necessary to provide working solutions for the TV’s people have.

​@dintis 

What is it exactly that you want? 

I have three (3) Arc Ultra’s each connected to an LG TV. I’m not having any issues with sound. If I want to disengage the Arc Ultra I can do so by opening the LG sound menu (with the remote) and selecting internal speakers. However, that would defeat the purpose of paying $999 for an Arc Ultra to then disengage it to hear the audio through the LG internal speakers.

BTW, if one doesn’t want to use the remote to return to internal speakers just pull the HDMI cable from the Sonos soundbar and the sound automatically reverts to internal TV speakers. 

Furthermore, if you want a set of headphones to cut the audio to any soundbar; that feature has to be programed into the TV by the manufacturer. 

Again, Sonos nor any soundbar implements CEC that is handled by the TV. 

Perhaps you failed to read the original issue.  The issue is that at least on some TVs across all the manufacturers, the TV fails to successfully snd permanently switch to any sound outputs from own menu (as intended and designed), because Sonos seems to reset the connection and reassign it to itself essentially stealing it after a few seconds.  I want decide what sound output to use.  Not Sonos.  If I want to use the headphones connected to my TV,  I should be able to do it.  
 

No pulling of hdmi cable, pulling the power cable and other ridiculous solutions should be necessary.  Either implement a software fix/workaround or add a soft switch in the app (other soundbars can be turned off using the remote or built in power switch) to power down the bar or disable it, if the software fix cannot be implemented.

All I can say is that it must be your TV. On any of my three (3) LG’s with Arc Ultra I can open the sound menu and switch to Optical or internal speakers. Granted I don’t have an optical device connected but when I do select optical-out the audio disengages from the Arc Ultra.