Hi ncmunk,
Yes, this is possible! Although your Beocenter receiver doesn't have Powerlink sockets fitted, you can still connect the speakers by one of the two methods below:-
1) Connect two speakers to the headphone socket of the receiver with this cable (an adapter is available on request for receivers with the larger 6.35mm headphone socket):
https://soundsheavenly.com/line-in-connection/77-241-minijack-to-beolab-line-in-using-phono-rca-sockets-one-cable-for-two-speakers.html#/2-length-1m
2) Connect two speakers to the speaker terminals on the back of the receiver using this special Attenuated Converter:
https://soundsheavenly.com/line-in-connection/33-power-amplifier-to-beolab-line-in-attenuated-convertor-kit.html and then use this cable to connect the speakers to the output sockets of the Converter:
https://soundsheavenly.com/line-in-connection/6-30-av-processor-pre-amp-sonos-to-beolab-rca-line-in-one-cable-for-two-speakers.html#/2-length-1m and you also need one set of these plugs:
https://soundsheavenly.com/beovox-passive-unpowered-loudspeakers/74-2-pin-din-plugs-sold-as-a-pair.html
Option 1 is cheaper, but the cable will be visible at the front of the receiver and this will disable any other speakers connected to the receiver. Option 2 allows the cables to be hidden and the Beolab speakers can be used along with your other speakers if required.
Hope this helps!
Kind regards, Steve.