Hej Peter!
You can only use old BL3500. Since a year or so they only have masterlink inputs. If you have a new one you will need a ML/MCL converter.
Beovision LX5500, BeoCord V6000, BeoSound 9000, BeoLab 8000, BeoLab 3500, BeoLab 2000, BeoVox1, BeoCom 6000, Form1, LightControl 1