Richardd, Richardd, Richardd,
Powerlink is the 8-pin socket that modern BeoLab speakers use, the red and black clips, if they exist at all, are for non-B&O speakers, or the conventional BeoVox speakers.
Yes, you ought to be able to run the 2500's off of the PL sockets on the MX-5000. I would caution you to be careful with heavy bass though. Unlike it's bigger cousins, the BL-2500's do not do their own bass-overload protection. Other than that, Richardd's instructions are fine.
Russ
We kid because we love.
Bang & Olufsen Tysons Galleria
McLean, VA USA