I do read "Headphone/Speaker Link Yes" so dive back into the manual at
https://esupport.sony.com/US/p/model-home.pl?mdl=XBR75X940D&template_id=1®ion_id=1&tab=manuals#/manualsTab to see how.
You'll have to get some audio bluetooth transmitter it seems and the red and such jacks do not seem to be the audio output.
I have a Sony XBR75x940d connected to a Sony NT5 sound bar through the ARC hdmi port.
I have Sennheiser 116 wireless (not Bluetooth) headphones and can't figure out how to get them to work. Connect to audio on the TV, red jack in red, black in white but only static.
The headphones do work as they were fine on the old Panasonic I just replaced.
Even when I switched to TV speakers I had not success.
Any help?
John

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