I replaced my Yamaha X485 with a Denon X2700 (5.1 speaker system). My Apple TV is connected to it. On my Yamaha receiver, it would correctly display the audio format. For example, DTS HD MA when playing a movie with this audio. However, everything on my Denon is displayed as 'multi in' on the front panel display and PCM in the info menu. I do get surround sound, but why is it not displaying the correct audio format?