Want good news or bad news?
We'll start with the bad guy: citing weaker sales figures than his video-capable counterpart, Google is interrupting his Chromecast Audio streamer.  Chromecast Audio was launched in 2015 to become the world's most accessible music stream on this side of a Raspberry Pi. Last year Roon was even able to become the cheapest Roon endpoint available.
The sound quality of the Chromecast's internal DAC is exactly what we might expect from a US $ 35 device – nothing special – but for a better sounding Chromecast experience, let's touch the mini-digital output. TOSLINK of the 3.5 mm socket for connection to an external DAC. It's still not the best digital streamer available – playback without pauses remains MIA for Chromecast streams – a non-problem for Soundcloud fans like yours – but you need a pretty decent hi-rig to expose its audible faults. It's just the ticket for entry-level systems like KEF LSX.
The good news is that Google is running out of the remaining stock on Chromecast Audio for a crazy $ 15 cheap. RUN …
Goodbye Chromecast Audio. We hardly knew it.
Further information: Google