all you have to do is hookup the airport express next to your second system, then from to imac, configure the airport express and name it "2nd system", or "rec room" or something unique. then when you want to play from itunes to this 2nd system, at the bottom of itunes, there is a pull down to allow you to pick which rooms or all rooms you want to distribute the music. in itunes, under preferences-advanced, make sure you click the button to have itunes look for remote speakers connected with airtunes. you can also share multiple itunes if you have multiple computers setup. doing it this way, you listen to the same itunes selection in all rooms you have setup. if you want multi-source from each room, you can setup a mac mini in each room all sharing the 1 large itunes repository from your imac and each room could have different music/radio playing. then remote buddy can control the computer you want your music to come from.
also, it doesn't hurt having your imac all all the time. all my macs are on all the time. they go to sleep after a certain period of time, but they will wake up when you prompt them. if you are nervous about running the imac all the time, get a cheap mac mini (older g4 for example) to run your itunes connected to a NAS.
good luck!
also, it doesn't hurt having your imac all all the time. all my macs are on all the time. they go to sleep after a certain period of time, but they will wake up when you prompt them. if you are nervous about running the imac all the time, get a cheap mac mini (older g4 for example) to run your itunes connected to a NAS.
good luck!