I'm about ready to chuck my sound bar across the room!
Model - Energy (Klipsch) Sound Bar Elite connected via optical cable (~3')
Problem - It makes this annoying quiet beeping noise. Have used it on two TVs now. An older LG and my new Samsung Q6. Doesn't matter what input source I'm using, it even does it with the TV(s) powered off (soundbar goes to sleep after x amount of time with no input).
Sometimes pulling the power plug on the soundbar and reconnecting fixes the issue, but not permanently for the remainder of that session. It typically comes back after a random amount of time.
Power chord has a ferrite choke right at the end that plugs into the sound bar.
Let's see if this works:
https://drive.google.com/open?id=1Of2hIikYYhbRr7DV93sVwF5zvoD8YBQB