Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Welcome to ASR. There are many reviews of audio hardware and expert members to help answer your questions.
Click here to have your audio equipment measured for free!
I think Apple TV models since 2015 don't have S/PDIF output, maybe OP has an older Apple TV.
BTW, some of the Optical to USB converters are close to price of a DAC with both USB and Optical inputs, I wonder if connecting to HRT Music Streamer II+ with all the converters is the best idea?
USB DACs require a USB host (i.e. a computer). If you use a SPDIF to USB card, you need a USB host running software to route the captured SPDIF signal to the USB DAC. This can be done with a raspberry pi running CamillaDSP (see my signature), but it isn't exactly a plug and play setup.