Hearing aids TV adaptor

Apologies for asking a non-Naim question. But I can’t find the answer elsewhere.

My wife uses Oticon hearing aids and has bought the TV adapter 3 to connect to the TV via the TOSLINK cable. However, it only works if the TV’s TOSLINK output is set for PCM rather than auto. (No idea what “auto” is.)

This means that PCM into the Sonos sounds poor. Set it to auto, and all is good; however, the Oticon adapter plays the TV sound for 10 seconds then stops. It’s as if the auto setting from the TV is not compatible with the adapter.

So, we now have two choices: set the TV to auto and Sonos sounds good (but the hearing aids don’t work), or set it to PCM and the Sonos sounds poor, but the TV adapter works.

Anyone else seen this?

The Sonos can probably handle surround sound formats like atmos.
Can you connect the Sonos via hdmi instead? And keep the optical output in stereo pcm for the aids.

Sonos is connected via HDMI ARC. Sonos is fine. The aids can only accept TOSLINK with a PCM source. HD channels, for example, do not use PCM as standard, so if I want the aids to work, I have to downgrade the TV and hence Sonos to PCM. TV does not give an option to have hdmi as one source and Toslink with another

In that case I think you’ll need another box; this one will convert hdmi to optical and you can set it to 2.0.
So tv via hdmi to the splitter box, and splitter box optical output to the aids.
Assuming your tv has a second hdmi socket.

Nice one. I thought id need some intermediate box. The one for the aids is not cheap, neither are the aids. Which surprises me they can not cope with the latest toslink in data.