JBL Control XStream Speakers with Chromecast Audio

[Rugby (aka Daniel or Big Dan)]

Nope. Many non-Google Chromecast devices improperly report their capabilities to Roon. The fix would have to come from the manufacturer. See the following:

Supported sample rate of Chromecast builtin

Roon only sends >48kHz audio to devices that declare the HI_RES_AUDIO_SUPPORTED flag via the Chromecast SDK. If your device doesn’t report this flag, it’s basically stating that it doesn’t handle anything over 48kHz. If your devices support >48kHz sample rates and don’t report this flag, there is a bug in their implementation of Chromecast.