· None of the above quite fits
· None of these quite match
· Chromecast Ultra supports streams of 24bit 192khz audio per the specifications, but Roon seems to think its limited to 48khz. Whats going on?
· Ubiquiti Dream Router
If you search the many other threads about Chromecast devices and kHz here on the forum, it has been quite established that no Chromecast supports more than 96 kHz and the only one you’ll get that out of seems to be the Chromcast Audio, while others work only with 48. (The Cast protocol itself does indeed support higher rates and some hifi devices do, e.g., Naim streamers work with 192, but the Naim people say that the protocol and Google’s implementation is not really made for that and causes high load, which is why they recommend against it).
The Google documentation is unfortunately very incomplete. I found this page (not sure how accurate) which seems to confirm the above paragraph: https://www.stylelaser.com.my/product/roon-everything-you-need-to-know/
In the end, it’s up to the device to announce its capabilities to Roon. Check the Device Setup in Roon for the Ultra and see what it says (and if you can choose anything higher than 48).
From an SQ persepective it does not matter, anyway.
Hi @Will_Oosterman,
Thanks for writing in and for sharing your report! @Suedkiez is quite correct with the above reply, unfortunately.
Have you been able to stream 192kHz outside of Roon at all?
Thank you! 
All of the Chromecast video focused devices are limited to 48 kHz. Only the Chromecast Audio supports 96 kHz.
AJ
For stereo audio, Google Cast supports up to 96 kHz (FLAC) as a theoretical ceiling. In practice, the Cast device discovery process typically limits playback to 48 kHz. Like @Suedkiez mentioned, this is a Google firmware-level constraint intended to avoid buffering and bandwidth issues with large files. Cast is really built for consumer convenience streaming and will default to lower sample rates to avoid disruption. Roon relies on the capabilities advertised by the Cast device and cannot force it to accept a higher sample rate. As a result, Roon downsamples content above 48 kHz when you’re playing to this speaker.
You can review Google’s Cast specifications here:
and
.
But let’s ensure that Roon is configured to use the max capabilities as advertised by the device. What do you see available in Device Setup? Please also share a screenshot of your Signal Path in Roon.
We’re going to allow this thread to auto-close since it hasn’t received any non-staff responses in a few days. If you have any additional questions, you can always request to re-open the thread here and we’ll promptly respond. Thank you!