I have tried to use my wireless headphones in conjunction with my external speakers so I can hear the sound at a different level to others.
I can get it to work but not properly because my soundbar is connected via HDMI simplink (Sonos Beam).
When I turn simplink off the Bluetooth speakers work great but no sound from TV Speakers or soundbar even if I pick multiple speakers the sound only comes out of the headphones.
Is there anyway around this?