Hi Pui106, your audi is correct. By pairing to the TV Adapter, the OPN automatically creates a new TV program for itself, and adjust the amplification in each frequency band to compensate for your hearing loss.
I think you’re right that the TV streamer probably does not process the streamed sound, it only amplifies it. But I think your high expectation is perhaps misplaced. You need to remember that the streamed audio from the video programming is already processed by the producer of the content, and any further processing by Oticon/OPN may go against the intent of how the video producer wants his/her audio to sound like. So it’s not Oticon’s place to judge whether the audio content of video is good or bad because Oticon is not the video producer. Oticon’s job is only to faithfully reproduce exactly what the audio is supposed to sound like as processed by the video producer. The same thing with streamed music -> faithful reproduction is the only acceptable goal here. Any further processing would be deemed unwanted deviation from the true sound and not desired.
But unfortunately, garbage in, garbage out. If the processed audio being streamed is bad/garbage, that’s what you’ll end up hearing -> garbage. But Oticon is not to be blamed, the video producer of the video content is to be blamed. Unfortunately many modern producers tend to add too much sound to their videos, especially busy background music to create and maintain a mood, which very often take away from speech clarity. You should try more video contents and hopefully you’ll run into other video contents with better audio, then you’ll come to appreciate the TV Adapter’s direct streaming more.
I think a big part of your issue is that the incoming audio to the TV Adapter is too loud, and that’s an instant turn off and naturally will not sound clear. The same happens to me (although I didn’t use the Toslink connection, I use the RCA connection on mine). Just remember that you can always turn down the volume on your OPN (via the volume/control button on your left OPN) to a comfortable level. Did you try lowering the volume to a comfortable level already?