A:AnswerProbably depends on the specs for your existing wall mount and how much it is rated to hold. I was able to use the same mount my 60" plasma was on.
A:AnswerHDR is a setting on the iPhone Camera app. The letters stand for High Dynamic Range.
It means that your camera will process photos slightly differently than normal in order to capture greater detail from bright and dark areas in your photo.
A:AnswerI’m not an expert on this subject, but I think the answer is not to use ARC if you want to experience the full ATMOS experience. I’m using a blue ray player that supports Atmos into an AV receiver. Here’s an article. https://www.nakamichi-usa.com/best-dolby-atmos