Wifi speakers do not work in Rensselaer's network environment at this time.
A solution is to use Bluetooth speakers or a Bluetooth receiver with audio output that normal speakers plug into.
Explanation: Apple AirPlay technology is limited to a single subnet. It cannot cross networks. While we could put the speakers on RPI_NETREG, they would never see the music stream from the desktop, laptop, smartphone, tablet. The source device is either on RPI wired or one of our authenticated wifi networks.
This is a known issue and Apple and other vendors are working to modify the protocol to work across networks. Until then, Bluetooth is the way to go.