Wouldn't it be great if AirServer could work like an Apple TV and an AirPort express, both at the same time? With this option you can enable both these features into AirServer. Once this option is enabled, you will see two AirPlay endpoints available for your Mac. One regular AirPlay receiver and one audio-only receiver suffixed with an 'Ex' in the end.
AirServer is bundled as a simple application which does not install any drivers or kernel extensions on your Mac. To uninstall AirServer, simply quit any running instances of AirServer and drag AirServer.app from the Applications folder to trash. AirServer, initially released as a simple menubar app, has always been the app that aimed at bringing “AirPlay for everything” to the Mac since its first version.
Use this feature if you want to keep watching a video on your iOS device and want to send only the audio-only part of the video to your Mac running AirServer.
Streaming to the audio-only part of AirServer also forces the iOS device to send audio in lossless quality as opposed to AAC compressed audio.