IN THEORY... To physically make the connection you would require US part number 0898127, which will plug into power to keep the "turn on" signal steady as well as adapting the PL to 2 RCA, which you can then adapt to the mini jack. On the other end you would connect the speakers to BeoLab 2 as usual.
I say in theory becuase the adaptor was designed to plug into the LFE channel on a non-B&O reciever and not for the application you're dealing with, though it would take a smarter guy than me to explain why it wouldn't work. Hopefully that's a start though.
Also, don't do it. It's a headphone jack powering a $6,500 speaker set. Your puny music files will not withstand their glory.
That is all.
There is scarcely anything in this world that some man cannot make a little worse and sell a little more cheaply. The person who buys on price alone is this man's lawful prey. - John Ruskin