Wow, that album is just recorded badly. The producer added a lot more air in the 10-14k range to the vocals. It is very distracting. It's a hiss to me, not fuzz though. They mixed it for earbuds. If you listen through your standard Apple white crap you will not notice it, I suspect, but you can still kinda hear those frequencies are attenuated.
Also, my speakers seem to be pretty fast and the notes in her vocal with much greater volume nearly hit me in the head. Hard to listen to at a decent normal volume. Compression, used judiciously, is sometimes highly necessary for making vocals palatable on stereos! And it's possible to automate compression just the way you would ride a vocal with a fader. That's a different issue though.
Probably turning down the output on the Oppo is helping because it might be causing actual clipping in the AVR, making it more of a fuzz than a hiss (pure distortion).
Also, my speakers seem to be pretty fast and the notes in her vocal with much greater volume nearly hit me in the head. Hard to listen to at a decent normal volume. Compression, used judiciously, is sometimes highly necessary for making vocals palatable on stereos! And it's possible to automate compression just the way you would ride a vocal with a fader. That's a different issue though.
Probably turning down the output on the Oppo is helping because it might be causing actual clipping in the AVR, making it more of a fuzz than a hiss (pure distortion).