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I had a similar issue. It turns out the Denon receiver was locked on 192.168.1.3 IP address. This was the same address my wireless card was using on my computer. I disabled wireless on my computer and reset my router. When I turned wifi back on the computer it picked a different IP address and all was well again. Hopefully this isn't going to be a regular issue. It was tricky to trouble shoot since both the computer and Receiver were accessing the Internet fine, but AirPlay wasn't working (no device appeared).
 
I have a Denon AVR X1000. From my iPad I can select AirPlay and YouTube wakes up the sleeping Denon and plays. My Mac - also on the same network, of course - does not see the Denon. What do I need to update? The Mac is on Sierra OS v10.12.2. The iPad is on iOS 9.3.5
 
How do you know it doesn't see the AVR?
Alt-click the volume (speaker) icon in the menu and check, if AirPlay audio receivers are there.
(the AirPlay icon on menubar applies to video only, so audio receivers won't make it appear).
Screen Shot 2017-01-14 at 11.48.07.PNG
 
How do you know it doesn't see the AVR?
Alt-click the volume (speaker) icon in the menu and check, if AirPlay audio receivers are there.
(the AirPlay icon on menubar applies to video only, so audio receivers won't make it appear).
View attachment 683615

From the iPad the video icon sees the AVR although only audio is sent, and that is all I want.

On the Mac I'll check the audio icon instead.
[doublepost=1484395216][/doublepost]
From the iPad the video icon sees the AVR although only audio is sent, and that is all I want.

On the Mac I'll check the audio icon instead.


Just checked. No such option on my Mac . :-(
 
From the iPad the video icon sees the AVR although only audio is sent, and that is all I want.
That's the thing - iOS AirPlay controls are different from macOS.
Just checked. No such option on my Mac . :-
You mean, your list of external speakers is empty?
First I'd verify the IP addresses of all 3 devices (Denon, Mac, iPad). What are they?
If they are all in same subnet, then you will need to start troubleshooting Bonjour service discovery problems.
Bonjour Browser is a good tool to start. Available for both iOS and macOS.
You shall see both _airplay._tcp and _raop._tcp services for audio AirPlay to work.
As far as I know, there is no switch in macOS to enable or disable AirPlay. It completely relies on service discovery on the network (Bonjour).
http://stackoverflow.com/questions/20287039/how-to-make-airplay-button-to-appear

Screen Shot 2017-01-14 at 16.09.31.PNG Screen Shot 2017-01-14 at 16.21.06.PNG
 
Yes, the list of external speakers is empty on the Mac. And, yes, they are all on the same subnet (via Router DHCP - the AVR is wired, the Mac and iPad are WiFi.) My iPhone is also fine.

Looks like - as per the other response - Mac OS Airplay is different from mobile iOS Airplay. :-( .
[doublepost=1484446186][/doublepost]Quite definitely it's how Macs 'work'. See screen shot attached. My AVR not available on the top right of my screen (or when viewing YouTune on Chrome browser), but is available in the iTunes app. :-(

https://goo.gl/photos/Y4hTQWMoeh4Z986C6
 
Yes, the list of external speakers is empty on the Mac. And, yes, they are all on the same subnet (via Router DHCP - the AVR is wired, the Mac and iPad are WiFi.) My iPhone is also fine.
OK, then it seems your AVR is only presenting itself as AirTunes (_raop._tcp) target, that's what the first AirPort Expresses did. Only way to tell would be to look at services your Mac sees in Bonjour Browser app.
Looks like - as per the other response - Mac OS Airplay is different from mobile iOS Airplay. :-(
They work the same, but the controls act a little differently.
My AVR not available on the top right of my screen (or when viewing YouTune on Chrome browser), but is available in the iTunes app. :-(
It will never show up in the AirPlay menu. As I said, only video-capable targets will be there. That is, the targets that can serve as wireless displays.
If you see it in iTunes, then the AVR AirPlay works as advertised.
Lately Apple started to distinguish the icons, as you can see in your iTunes screen. AirTunes (was the original name for what AirPort Express did) transmission now has different icon that you can see in iTunes (has waves instead of screen behind the triangle).
I am not sure if the _raop._tcp service is good enough to serve as audio output for macOS. This one may require _airplay._tcp. This would explain why you can use your AVR for playing back music but not as general audio output for macOS.

The bottom line - if you can send music from iTunes to your AVR, then it works as per spec. At least how it was back in 2013 (based on your AVR model).
Over the years, the AirPlay has changed quite a bit and with the introduction of Home Sharing, all 3rd parties are basically ruled out (Home Sharing requires authentication via iTunes Store account / credentials).
 
The Mac OS is silly then. Clearly it could simply allow audio-only connections like iOS does rather then separate it. It makes Apple devices unnecessarily complicated, something I left Microsoft Windows for.
 
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