To connect to your Mac you should use a Beoport. It´s a small quite inexpensive box that brings your MAC sources to Masterlink and therefore to the rest of your system. With the new Linkplayer SW you should be able to listen to N.Music (even if BC2300 does not support this).
I assume you just need the sound of the Samsung LCD played through B&O Active Speakers. To do so you need a Beolonk Active Version 1636 with PC-In.
All in all not very expensive and to be found also as second life or in ebay.
And now to your question: You can Use Airport Express and the Aux in to stream MAC to BC2300. For the Samsung LCD I do not know an appropriate device.
BeoVision 8-40 / BeoVision 8-32 / Beovision 6-26 / BeoSound 3200 / BeoSound 1 / BeoLab 3 / Beolab 6000 / Beolab 2000 / Beoport / Beomedia 1 / 3* Beo4 /BeoCom 5 with VOIP