I asked Denon but no response.

[Good4it]

Does anyone know if my Denon 4400h will play Amazon’s Music Unlimited HD ? I know a 4500 will but can’t get it to work on mine.

 

[Pogre]

Depends on your device. I can't get above 16/44 using my fire tv box. My laptop will give me max resolution using the app, but I had to go into settings and allow it.

 

[Good4it]

I’m using an iPad generation 3.

 

[Pogre]

I’m using an iPad generation 3.

I have a windows 10 retired laptop I use for HTPC and had to go into the sound settings and raise the resolution limit. Your receiver should be capable. The player seems to be the limitation. Unfortunately I don't know much about Apple stuff.