A:AnswerOLED can actually “turn off” pixels whereas QLED is a film over LEDs. The easiest way to tell the difference is if you look at display models and they show a black background with a white image or text-you’ll see “ghosting” or “bloom” effect where the white light bleeds onto the darker parts of the image.
A:AnswerNeither, it an OLED ( organic light emitting diode). It’s a different technology. Very expensive up till a couple years ago. Sony was the pioneer in this technology. Main benefit is the blacks are black and the whites white with no bleed over. Also, infinite viewing from the side.
A:AnswerThe manual says you can, but only if the set itself has the correct speaker cable inputs. I own the A9S 48 inch set, and it does not have them. I guess the larger sets have them.