I have one good set of speakers (iSub with those sphere speakers, you know the ones) and I want to be able to use them with my laptop and my iMac without changing my setup. I have an AirPort Express, but I take that with me every few days so I'm looking for a solution that doesn't involve reaching behind the desk to move wires around all the time. Is there any way for me to play a song in iTunes on my PowerBook and have the audio come out of the speakers attached to the iMac? P.S. I searched and did not find anything, sorry if this has been asked before.