
To do this, simply connect the Mac to an audio system or a set of external speakers. AirFoil running will wait for iTunes or another program to use it as an audio device. However, if you are not willing to shell out about $100 or more for a new AirPlay and you have an old Mac lying around (especially a Mac Mini), then one option is to turn it into an AirPlay hub. In general, AirPlay devices are hardware accessories like routers such as Apple's AirPort, or media appliances like the AppleTV. If you are on the same wireless network as the device then it will be available to your Mac, iPhone, or iPad to play music via iTunes, or even be used as a general audio appliance for system sounds. Apple's AirPlay feature is a convenient technology for sending audio to various devices.
