Hi. I am looking to stream audio using airplay mirroring in the classrooms of an English language academy. This will allow teachers to play audio listening files using iPads instead of hunching over computers. I realise there are two solutions, airport express and Apple tv. I am interested in the latter because I am also going to order video projectors next month. Is it possible to use apple tv without a tv? This sounds like a really strange request however for now I would like to use the optical out only. Thanks in advance.