Alex:
Unfortunately yes this will not work as the Encore currently has no connectivity at all for multiroom systems.
A Beosound 2300 only has Powerlink.
A Beosound 5 Encore only has Powerlink (and has BeoNet for the future, but that's another thing)
With a Beolink converter (1611), I can connect (and use in linkrooms) the radio/CD from my BS2300 to a Beovision used as master.
Why couldn't I do the same with the Encore and the BS2300? (I know you're a store manager, so you may be answering that to preserve sales of "normal" BS5 in "masterlinked homes", but you can say the truth, no one is listening here !!)