Question about Harman/Kardon Citation Sub

The Harman/Kardon Citation Sub is part of a multi-room system and can be connected to other devices on the network via Wi-Fi. It is compatible with Google Home, but it usually needs to be connected to another Harman/Kardon Citation device such as a soundbar or speaker to utilise the full functionality. However, it is possible to use the subwoofer on its own and control it via the Harman/Kardon app, but direct control via Google Home without another associated device may be limited.