On the B and O web page, if you go to the menu for manuals, it is possible to select the Beolink Active manual and it explains how to adjust the teble and bass. Hope this helps.
Beovision 7-55 with Beolab 7-4, 9s and 4000s
Beovision 10-40 with Beolab 1s and 6000s
Beosound 1, 5, 2000, and 3000
Beotime, Beotalk, Beocoms