What causes Sony TV audio source to not always be the external source of Arc Ultra upon turn-on?

Forum|Forum|9 months ago
December 27, 2025
11 replies
320 views

System info:

Sony 77 A80J TV
Apple TV4K (connected to Sony TV via HDMI 4)
Sonos Arc Ultra (connected to Sony TV via HDMI 3 eArc)

Issue: Turn system on (usually via Apple remote) after everything being off overnight or some period of time and sometimes Sony TV immediately will be using the external audio which is the Sonos Arc Ultra and sometimes I’ll find the Sony TV will be using the internal TV speakers and I have to manually switch TV audio source to the external audio source (Sonos Arc Ultra).

Question: Anyone know what causes this erratic behavior and how to fix it so the audio is consistently external audio of the Arc Ultra?

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Best answer by Corry P

Hi @Hans-TX

Thanks for your post!

I am sorry to hear of this issue you are having with your TV sometimes using its own speakers on power-on.

I recommend that you reboot your TV by unplugging it from power for at least a minute.

If that does not solve the issue, then there is a likely HDMI-CEC conflict caused by another HDMI device - I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.

Show previous replies

AjTrek1

I will say this…

If you are having to select the Arc Ultra vs the TV speakers then there is an issue with the CEC implementation which points to the TV settings.

When using the AppleTV remote to turn the TV on it will most likely select the HDMI input that the AppleTV box is connected to.

The issue/behavior described above are different with the latter being expected behavior.

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