Better sound from youtube?


Word up. 

Sometimes when I stream, I will just stream Tidal from my oppo. Other times I will use a HDMI for my phone to the oppo's front port and stream Amazon HD or YouTube. My question is why are a lot of the YouTube tracks I stream so much more high quality and vivid than either the title or the Amazon? My Amazon is the top level they have the ultra HD. The title I scaled back to the basic sound quality.
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