[quote user="olemol"]

-Have anyone tried it before?[/quote] 

similar, and so have others

[quote user="olemol"]can i shuffle between macbook and iphone as the music source? [/quote] 

yes

[quote user="olemol"]or can it only be set up with one of them at the time?[/quote] each iDevice can "talk" wirelessly to the AE, I presume that last one to talk will gain control (that is how my ATV tends to work) [quote user="olemol"]

-Do i need any cross-over cables to connect the bl3s to the AExpress?[/quote] you will need a mini-jack stereo splitter and then these cables from B&O:

[quote]

...To a non-Bang & Olufsen system:
Use a special adapter with an ordinary phono/RCA plug in one end, and a DIN-plug in the other (optional accessory, available from your Bang & Olufsen retailer). Remember to set the SETUP switch to LINE. 

[/quote]

[quote user="olemol"]

-How do I set up iTunes to play wireless? [/quote] good question ! I thought it was a preferences setting, but I can't find it now - look for a small arrow on the bottom right hand corner of the iTunes window - clicking it should present you with a choice of the Macbook's speakers or the AE [quote user="olemol"]can it be played wireless?

[/quote] yes

thanks a lot! great answer :)