I could be wrong about this as my memory hardly operates any more, but I believe you may need line adaptors for BeoLab 2500s since they don't have a native "line" mode. In the USA these are commonly called BeoLab 2 line adaptors and have the ability to put a 12v power supply to the turn-on pin so that PL-only speakers (BeoLab 2, BeoLab 7, BeoLab 10) can remain turned on and operable. I also recall that they're not magnetically shielded so your dealer will have to order you the special hat.
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