Sloop, help me here please I am new to the DAC party. I am trying to piece together the parts of the puzzle from the different forums and learn that 1) I should be using Roon and 2) I don't necessarily need an NDX? Should I trade in my NDX and Mojo for a Hugo 2 fed from a Raspberry Pi running Roon bridge connected to my iMac via Ethernet? Motivation would be that any further funds could then be channeled into better Naim amplification. Or is there a reason to keep NDX? Can I then control volume remotely? How do I connect Apple TV and is there a substitute for the system automation in conjunction with Harmony remote?Sorry for the long question, would appreciate your help as this is a minefield if you don't know what you're getting into...
I'm not quite sure what exactly you are asking.
There is no "should" be using Roon.
Roon gives an outstanding interface (link) to your music collection that is so far ahead of the Naim (and most other offerings) it's not funny. Once you have Roon running on your imac you can have roon bridge running on a Raspberry Pi on the same network connected via USB (or Optical/coaxial if you get an add on) to for example the new Hugo 2.
I use my amplifier to control the volume, you can set up Roon to have a volume slider but I prefer not to do too much manipulation wuth the signal. Similarly the Hugo has a volume control but I tend to go with the consensus here and leave it at the turquoise level.
I presume you can attach the apple TV to another input on the Hugo.
For me it makes more sense to spend money on Naim amplification which is truly their forté and use something like a Raspberry Pi into the best DAC you can afford. (There are other more bespoke options like the microrendu and SOTM 200 which have their fans as well). And as you can see from Mr Underhill there are a lot of further modifications you can try.
My advice would be to get a raspberry Pi with a HAT (google hifiberry-digi-bundle) which you'll get for under €100. Try this into your mojo using Roon using optical. Compare it to your NDX into the mojo. Make your own mind up if there is any diminution in sound quality. Make you own mind up if the Roon ecosystem is as good as we all say it is. Roon give a 14 day trial and their forum is full of useful information as well as many helpful posters.
Roon will also play to any Sonos, Squeezebox or bluesound products you have in the house. You can get another Pi with a headphone out for the bedroom. You can have music in every room in your house with Roon at not great expense.
I hope this helps.