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"roon will not send anything greater than 24/96 to Chromecast devices. In the world of the Chromecast SDK, devices either advertise that they support 24/96 or they do not; there is currently no way for developers to determine with certainty that a device is capable of more. The signal path in your screenshot shows that Roon is resampling 24/192 content down to 24/96 before sending it to the C338, which is exactly what is expected. My statement was more of a hypothetical question regarding what would happen if we had a C338 in-house and what would happen if we blindly fed 24/192 content to the Chromecast implementation on the device.
If you’re concerned about avoiding downsampling of 24/192 content, I would look into a Roon Ready bridge device plugged into one of the C338’s digital inputs or an external DAC via one of the analog inputs. I don’t think Chromecast ecosystem support for >24/96 is a high priority for Google and we can’t do much without the right developer tools."