I bought this a few days ago while on a trip abroad:

https://www.cnet.com/reviews/chromecast-audio-review/

I haven't opened the package as yet, but I was wondering if some of you have any experiences with the installation process.
My intention is to connect it to my AVR so that I can play music using a 5.1 speaker setup.

From what I read I will be able to play songs giving commands from my Android phone.
The big question is whether I will require to subscribe to premium services (Spotify, Google, etc) to get quality Hi-Res music.

Any input will be welcome.
I will provide feedback once I'm able to install it and test it.