Does the B-Fi receive streamed music from your smartphone, or directly from the Wi-Fi network?

For music streamed through Audioengine Control App, or from streaming applications built into the Audioengine Control App, the B-Fi streams music directly over your WiFi network. The stream will continue whether your device is taken out of range or turned off altogether.

Airplay, generally speaking makes a connection between your source device and the B-Fi, through your network. If your device goes out of range of the network, or the application on your source that is playing audio is closed, playback will stop.