A:AnswerMake sure you do. It disconnect the power or it will go back to default. I learned this the hard way as it was plugged into an outlet controlled by a wall switch. Once I figured it out and plugged into a plug that was always live the problem went away
A:AnswerIf it is hooked up to your tv sound settings set to the hook up for the soundbar, then you have to turn tv sound to zero
Then have soundbar on din mode and that will allow tv to go through soundbar
A:AnswerYes but you probably won't need them. We have been very impressed with the acoustics just the way it was designed. We don't miss our expensive sound system (still in storage after a cross country move) at all. We didn't expect the acoustic grill thing on top to work but have been pleasantly surprised.