Can I use the new Apple TV without a TV to play my Mac's audio to my stereo?
I stream music to my stereo via my AppleTV all the time without needing to turn on the TV, and control it via iOS devices. My current setup is AppleTV -> stereo via HDMI, and stereo -> tv via HDMI. The stereo turning on wakes up the AppleTV, but if the stereo is left on, starting to stream something via AirPlay also wakes up the AppleTV.