I have a Raumfeld Soundbar with subwoofer. I located the option for setting the subwoofer’s crossover frequency and volume within the app. What is this for?

Under the menu option "Subwoofer crossover frequency,” you can determine up to what frequency the subwoofer should play. We recommend leaving the crossover frequency at its factory setting if you plan to position the Raumfeld Soundbar in the immediate vicinity of the subwoofer. If the subwoofer is placed further away, such as towards the back of the room, a less harmonious soundstage may result. In this case, you can change the subwoofer’s crossover frequency in the app until you are happy with the sound. If, for instance, the Soundbar’s soundstage seems too thin, you can lower the crossover frequency. If the bass seems too flat, simply raise the crossover frequency.

It’s also possible to perfect the system’s soundstage by altering the subwoofer’s volume levels.