First connect the Ceres BT speakers via Bluetooth to your computer’s Bluetooth manager.
Then, in the sound preferences dialog for your computer:
(Mac OS X - Use Sound Manager or Audio MIDI Setup) or (Windows - Sounds and Audio Devices), select the Ceres Bluetooth entry as your default output.
In your audio application’s configuration, select Ceres as your output device.
Please contact PreSonus Technical Support by creating a Support Ticket at My.PreSonus.com for further assistance.