Originally Posted by gwsat
I will select which speaker or speakers get the test tones through my Yamaha 3060, which gives me control over which speakers do what. Anyway, I am really only interested in using REW to configure my new subs because YPAO has done a more than satisfactory job of configuring the other speakers. It ain't broke so I don't plan on fixing it. All indications are that the AirPlay/Apple TV solution is just what I need and, fortunately, the only one I have to satisfy is me.
Just as an FYI - in order to do sub integration measurements (i.e. How well do the subs crossover with the mains etc) you'll still need to be able to tell REW to run sweeps on specific channels. Each Channel represents a speaker or combination of Speakers. For example Channel 3 is LFE+Center and Ch4 is LFE only (just sub will play). You'll likely use Ch1,2,3 and Ch4 at least. Ch1,2,3 will allow you to see how the Sub is integrating with the Front Left, Center, and Front Right at the crossover point. Ch4 will allow you to see how the LFE response looks on its own.
REW needs to be able to tell your receiver which channel(s) should output (through a selection you'll make). It is able to do this because the output device, when connecting an HDMI cable from Mac directly to the receiver, is the Mac itself.
If you have your Mac AirPlay to an AppleTV, your AppleTV effectively becomes the output device. The moment of truth will be whether or not REW picks up the available channels somehow through the Wireless Airplay connection and then through the AppleTV's HDMI connection.
I've never tried to use this process, but even if REW can find the separate channels through those 2 hops, my initial thought is that the delay incurred from the Wifi connection lag (even if tiny) may cause an issue with your measurements. You would definitely want to use a timing reference, and maybe
that will help? That's still a pretty big maybe.
I'm actually curious to see how it goes. If it works, this would simplify my own measurements in the future as well.