Every house needs a good speaker system, and a good speaker system is even better if it can be accessed by multiple devices over the wireless network. AirPlay uses Apple technology that was reverse-engineered in 2011, which means that third-party devices can now participate in the fun. AirPlay allows any Apple device to broadcast whatever is coming out of its speakers to an AirPlay receiver (which will be our Pi in this case). There is a way to send audio from PulseAudio to AirPlay receivers, as well as an application for Android called AirAudio. Sadly, the Android application requires root to access the audio of other applications running on the device. To keep things simple, we’re going to use an iPad as the test client.
http://techsource24.com/2016/01/28/wireless-raspberry-pi-speaker/
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