Using your Chromecast built-in audio device.
To start using Chromecast built-in with your audio device, connect your audio device to a Wi-Fi network using Music Center, then download Chromecast-enabled apps to your smartphone.
See Compatible models and check that your audio device is Chromecast-enabled.
How to connect your audio device
See How to connect to your audio device for details.
Download Chromecast-enabled apps and enjoy music
Download Chromecast-enabled apps from Google Play or the App Store to your smartphone.
Start a Chromecast-enabled app and play back music.
Tap (Cast button) and select the audio device. The Cast button will turn , letting you know that the audio device is connected.
If you play back in the group (Wireless Multi-room), create a new group using the "Google Home" app.
Music will be heard from the audio device.
For details on how to use Chromecast built-in, follow the links below.