Hi, I have bought a new Wireless Speaker (Naim Mu-So Qb). It works very well but I have only one problem: If I use the Speaker with the MacBook, I can't choose the Speaker on YouTube in the AirPlay Button. There is only "Searching for devices..." On the iPhone I don't have this problem. I know that I can choose the speaker in the Settings as main speaker for the MacBook, but I want it only for YouTube like on the iPhone. And btw, iTunes also works very good without problems. So what do I need to do?