Yes, you can, IF you got newer version without MCL. 2005 and newer? I thought you needed both PL connection and a ML, but according to the manual on the B&O-site only talk about a ML. Maybe the have changed it one more time since 2005.
http://www.bang-olufsen.com/UserFiles/File/ug/BeoLab3500/beolab3500_userguide_english.pdf
Beovision LX5500, BeoCord V6000, BeoSound 9000, BeoLab 8000, BeoLab 3500, BeoLab 2000, BeoVox1, BeoCom 6000, Form1, LightControl 1