maxwellmember wrote:
DAC says run through coaxial input from STB
I really don't know how you are doing this. Apple TV only has optical toslink output. This is mechanical incompatible to coaxial spdif. There are no "mechanical" adapters available since coaxial is electrical and toslink is optical...
You really have to connect your Apple TV via a toslink cable to the optical toslink input of your DAC. In the link you have posted I can see a little switch for selecting the input source. Make sure that you choose the right position for the optical input.
I can also see that this device has a headphone output. Try plugging headphones in (hold them away from your ears since it will be full volume) an check whether you can hear the sound of your Apple TV.
If there is no sound something is wrong with your DAC.
maxwellmember wrote:
Apple TV is plugged into DVI on AV4 and the audio is in the L/R inputs on AV4
On my TV settings I have the following
Source - STB(DTV)
Audio Socket - None
IR Socket - None
HDTV - DVI-I
The connections to TV and the settings are right assuming you are using AV4 as source in menu.
If it's still not working I have no other ideas.