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It was also an spdif optical out which was super nice to hook into a better DAC.

Yes, although the actual streaming was lossily compressed, which more than negates any gains from using a better DAC.

(edit - this is incorrect; the Chromecast Audio was apparently updated at some point to support lossless streaming)

No, that is not true. Chromecast streaming is lossless, so it is certainly possible to stream hi-res flac files bit-perfect.

Thanks for the correction. I think Chromecast Audio initially didn't support lossless streaming, but at some point it was updated to support it?

Regardless, thanks, and I updated my post!

Still using mine to this day

You can also put multiple chromecast audios in a group in google home and they will perfectly sync audio across multiple rooms like a ghetto Sonos setup!

One of the best dollar-to-performance purchases for home audio.

Which is especially nice if you install Owntone ( https://github.com/owntone/owntone-server/ ) -- now you have a nice web interface for playing music to any or all of your systems.

https://www.amazon.com/Bluetooth-MultiRoom-Preamplifier-DLNA...

Handles AirPlay, DNLA, Spotify Connect, Qplay, UPnP