

The other advantage is the better audio quality, though I believe Bluetooth has gotten better over the years and often, the speaker is the weakest link in the chain anyway. There are speakers now that can handle multiple Bluetooth connections, but still it's much less flexible. So every AirPlay sender can stream music to the speaker, without pairing, and without "shuffling" the active connection between the devices. Once the AirPlay speaker is connected to the Wifi network, it can be seen by any other device. The main advantage in my opinion is no pairing. There are several advantages of AirPlay over Bluetooth. With those two, the content is stored locally (or at least buffered) on the sender, and streamed to the receiver without an active internet connection needed. So it's not exactly the same as AirPlay and Bluetooth, there's just some overlap. Your phone will not stream that song to the ChromeCast, but instead will send a URL to the ChromeCast where it can find the song itself and stream it from. So, say you are using Google Music on your phone, and you select a song to play on your ChromeCast. You are confusing it with ChromeCast, which essentially is a device that connects to the Internet via Wifi and can be told to play back web streams. Basically, it's the Wifi alternative to Bluetooth. AirPlay is local music streaming via Wifi.
