I don't have an aux input on my TV, but I still want to use the headphones here and there without always having to reconnect everything. Now my question is whether the Hdmi output only provides picture or also sound. Or whether the sound can only be used via the aux output?
Would be great if someone knew more.

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see manufacturer link under specifications, it is stated there:
Automatic switching to stereo (2.0) when using the jack socket and
automatic muting of the digital output

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With the HDMI Audio Extractor, you can extract the sound from your HDMI output and route it to your headphones or stereo system.

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You can tap the sound with an RCA plug and feed it to headphones or a stereo system.

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