Before I bought the Wiim I used a Firestick and a TV as the display. From time to time I'd notice that the sound was very slightly distorted - most noticeable in vocals - and just not quite as dynamic. Sort of warm and fuzzy. I know it wasn't all in my head because it was enough to make me look up from my book or browser or whatever I was doing, and sure enough AM HD had for some reason decided to play in SD. This didn't happen too often, but often enough. I can't say it made a huge difference but it was noticeable, which is why I asked about the bitrate. If it's not that, or one of your settings, that I've got no idea. There should be no difference.