Okay, so I am interested in the Airport express, but I am not exactly sure how it works. In theory, I would like the ability to use my airplay devices to stream music to the speakers around my apartment. I would just like to know what is necessary for this setup. How does a device connect to the Airport Express? Basic as much information about the setup as possible would be nice. I've looked online but I can only find basic setup information. Is a specific speaker required? Specific Receiver? Thanks for the help!