A:AnswerI'm sorry to hear you're having problems with the sound but as of so far I haven't had any delays with sound. This tv is amazing and the sound is perfect, even without a soundbar installed. Sounds like you may have a defective unit.
A:AnswerYes it can be mounted, if mounted make sure that the bracket comes with spacers, do not mount directly to Tv other ice you will damage the screen, because it will crack with the pressure.