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I'm currently using Spotify which I think casts at 44khz/16 bit. I'm taking a look at Tidal which will stream at 96/24.
Found a thread here which talks about the performance of chromecast with external DAC if anyone's interested. Looks like a goer to me.https://forum.audiogon.com/discussions/chromecast-and-external-dac
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spotify says:
Music quality details
Check out a side-by-side comparison below.Free Premium
Web player AAC 128kbit/s AAC 256kbit/s
Desktop, mobile and tablet
Automatic - Dependent on your network connection
Low* – Equivalent to approximately 24kbit/sNormal – Equivalent to approximately 96kbit/s
High – Equivalent to approximately 160kbit/s
Automatic - Dependent on your network connection
Low* – Equivalent to approximately 24kbit/s
Normal – Equivalent to approximately 96kbit/s
High – Equivalent to approximately 160kbit/s
Very high (Premium only) - Equivalent to approximately 320kbit/s
Edit - formatting has got lost but essentially, normal spotify is 96kbs which I would suggest is below the level where hardware upgrades are going to help that much.
https://support.spotify.com/us/using_spotify/system_settings/high-quality-streaming/
that's (theoretically) "high res" audio. I've not looked at chromecast, however it seems unlikely that you are getting this resolution on the majority output.
FLAC is compressed CD quality so 16bit/64khz.