Robert
You can use the digital out OR the analog single ended out, either work well and you can set the volume level of each for matching to a headphone amp.
I use a Burson headphone amp that has analog inputs and digital coax inputs ( usb too but I do not use that).
I actually found the analog inputs to be better on the Burson.
One nice thing on the 2170 is you can set the type of output, full range, headphone, tape out etc.
You can use the digital out OR the analog single ended out, either work well and you can set the volume level of each for matching to a headphone amp.
I use a Burson headphone amp that has analog inputs and digital coax inputs ( usb too but I do not use that).
I actually found the analog inputs to be better on the Burson.
One nice thing on the 2170 is you can set the type of output, full range, headphone, tape out etc.