The app will allow you to switch between the two subwoofers by clicking on the Discover button in the top right of the app.
You would position each sub where you want them in the room and then individually calibrate them.
We understand that one sub will have an influence on the other, however right now we do not have a way for the subwoofers to communicated with each other. This would require the phone to be able to talk to both subs at the same time and BLE does now allow for this at this time.
We have used a two sub configuration in our office with good results.