In order to use Phantom with Sonos connect, you will have to do it via a Toslink optical cable.
Simply configure your Phantom(s) over WiFi, activate the optical input, plug it to your Sonos connect, and stream music from your Sonos application.
To activate the optical input, you need to access your settings from Spark then Devices and enable the optical input of your Phantom(s).
You can also connect Sonos directly to Phantom without the need for Dialog.
Do not mix and match Sonos and Devialet speakers to avoid phase and latency issues