@allen
Sorry for mistake I sent the original Google translation. Here is the advice previously written in Italian. An interesting multiroom system could be this: Nuvo Player Legrand art NV-P600. 20 watts rms installation in the electrical panel. With Spotify it only sounds with a Premium subscription. For the cases you could use Garvan.
thanks for correcting
Hello
Iām also starting the journey with Multi-room audio, squezeebox was all the time my favorite option but recenty I saw on some Chinese portals arylic.com solution. It have competetive price (might be cheaper than rasbery + HiFi) and according to some YouTube tests works great. The only thing that I m not sure is the openhab support. Just wonder if anyone have chance to test this?
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Is there a way with Squeezebox to play mutliroom from a line in? for example if I want to stream my TV or a Chromecast?
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In theory yes, saw information tha you need additional usb card for that.If this will work cannot confirm - thats was one of the reason that I starteted to investigating orher options, seems arylic by defauly support line in.
Whilst not strictly a multi-room setup, thought Iād share anyways.
I have a Pi 3 with a DigiAMP+ (from iqaudio.co.uk) running to 2 C165 Monitor Audio ceiling speakers running VolumIO.
Reason I bring it up is that I then use IFTTT and webhooks so that I can say āAlexa, trigger my musicā which then plays a playlist Iāve created called āmy musicā. Have also setup a number of web radio URLās on the player so can trigger these using Alexa too. Below is an example of turning the volume down using Alexa;
http://xx.xx.xx.xx:3000/api/v1/commands/?cmd=volume&volume=minus
where xx.xx.xx.xx is my external IP address.
Hereās a link to the VolumIO API for reference
https://volumio.github.io/docs/API/REST_API.html
Might help someone
another multi-room story share: https://davison.github.io/2019/03/09/multi-room-audio-I.html
It doesnāt mention in the write up, but the squeezebox players are also known to and controlled via OpenHAB, including as part of rules that turn them all off as part of an end of night lights-out button.
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Nice work 
ty 