A:AnswerI wouldn't necessarily use this for digital signage and no it work in portrait mode unless your signage software can rotate it. There are panels specifically made for digital signage so you might want to check out CDW (cdw.com) They are a pure commercial / enterprise IT company. (I work in commercial IT) or some other digital signage supplier. Most of these TV's were not designed to be hung vertically just for ventilation properties alone and could ruin it from overheating. It boils down to the software and your video interfaces.
Do your homework. True digital signage done right is not cheap.
A:AnswerIt is not recommended to have sound from both the TV and an external audio device (e.g., soundbar). Each may or may not have audio delays that are difficult to synchronize. The echo you hear is evidence of that. I recommend you go into the settings and select the audio output to your soundbar. This should stop the TV audio and this eliminate any echo. However you may also need to go into the soundbar settings and adjust the audio delay setting ito eliminate any lip sync issues. Good luck!
