A:AnswerIt does have EARC it port 2 on ur HDMI on the side of your tv. I have noticed that some of the features are grayed out due to compatibility with the device connected. Hopes this helps.
A:AnswerYou would need to connect with HDMI. Your Mac could be connected to stream music as it shows as a device that can be connected to the TV but I not tried to do this.
A:AnswerIt does not yet have support for the HBO app (neither HBO Now nor HBO Max). However, I use the screen as a workstation as well as the TV in our bedroom, so I just stream HBO Max from a browser--simple workaround until the app is available.