A:AnswerIf there is its not enough to notice, Been using mine for a month now. I do have the sub on the floor next to the tv. Don't know if I would have a different answer if it was across the room behind the couch.
A:AnswerConnected the Soundbar with an Optical cable on a Samsung TV. When you fallow the setup instructions and turn off the TV speakers - set the soundbar for Surround Sound, It will automatically the the TV speakers for Surround Sound.
A:AnswerMy understanding from Samsung’s website is the Soundbar R650 and more expensive models (2017 and newer) are 4K compatible...Use the HDMI (ARC) on both 4K TV and Soundbar with 4K HDMI cables of course...