I would combine the ADI-2 Pro with a RME recording interface, this integrates best.
I am running my setup this way since years.
Then you have TotalMix FX as digital mixer and by this much better control over the routing of audio in general.

In this blog article you can see, how nicely this integrates / fits into each other.
https://www.tonstudio-forum.de/blog/Ent … our-Setup/

Not knowing your budget, setup, expectations I would propose to look at the quite new UCX II. It would be a phantastic interface for you in every aspect. It has the same compact form factors and got so many very useful features from the flagship interfaces, but without having to spend that much money.

The ADI-2 Pro uses only 2 out of the 8 channels and its routing capabilities are very pre-determined by the routing modes.
I think adding an ADI-2 FS might perhaps be possible but I would really recommend to spend a few bucks more and getting an UCX II as base to get a really round setup.

The UCX II with DURec you can even use as field recorder / tape deck if you like and is stand-alone operateable.

The setup in short

PC
|
USB
|
UCX II---AES OUT------------->AES IN---ADI-2 Pro--1/2---Active Monitors
         \----AES IN<-----------AES OUT---/                 \--3/4---Headphones

Clock Master                         Clock Slave

Alternatively you can use the ADAT port with SPDIF, then you do not need to use the break-out cable on the ADI-2 Pro for reaching the AES port.

The UCX II can be / should be clock master in this setup. The application (e.g. music player) will set the sample rate e.g. through the ASIO driver. The ADI-2 Pro receives the clock as clock slave from its digital input (AES or ADAT).
By the special design of the ADI-2 DAC/PRO series of devices the  final D/A conversion will be performed by the internal FS clock in highest quality (even if the device is configured as clock slave).

Thanks, Waedi.

The purpose of the extra analog inputs is to connect more than one analog source: a turntable and a reel-to-reel tape recorder/player, both having fully balanced XLR outputs. Right now, my turntable uses a moving coil cartridge and sends its fully balanced analog signal through its XLR output into the XLR balanced/differential input of my phono preamp, which in turn sends out a fully balanced analog signal through its XLR output into the balanced analog (dual-purpose) XLR/TRS input of the ADI-2 Pro. As we well know, the ADI-2 Pro has only one such balanced analog input. I would like very much to be able to use my reel-to-reel player with the AD-2 Pro without having to unplug the turntable...therefore, my question about the best way to add extra XLR inputs do this; perhaps with splitter cables or a suitable passive switch box, or some active audio interface. I use the AD-2 Pro as an external room equalizer when listening to analog through my speakers--obviously, for digital sources all that is done internally (D>A, no A>D>A).

Waedi, do you happen to know if the XLR/TRS analog input of the AD-2 Pro is both balanced and differential?

Thanks again...........................Dr. Larkos

+1  nice idea. Didn't think of this, switching sound as the best and most cost effective solution if none of a recording interfaces capabiliy would be useful for the customer.

Regarding your comment "no computer nearby".

I am uncertain whether it is maybe still an option for you if you think about how long AES or ADAT cables can be.

Let's put my living room as an example.
On the one end I have my recording corner, on the other end/side the HiFi corner.

The recording corner is actually my work place for everything that I do with the computer:
Office, Internet, Recording, listning to music, gaming.
There I have UFX III as a recording interface and am using an ADI-2 Pro FS R BE as reference converter with all of its features.

Then I have a long ADAT cables from the recording interface (UFX III) going to the 2nd ADI-2 Pro FS R BE, which does all AD/DA in my HiFi Corner to all involved devices.

Recording Corner:
UFX III ---- ADI-2 Pro FS R BE
|
|
| ADAT (15+1=16m)
|
|
Oehlbach Optosel 4:1------ADI-2 Pro FS R BE
       TV
       BluRay
       free

Either you get a recording interface and have the possibility to connect it to a computer.
If you use ADAT you can use up to 15m without issues, I have even another 1m on top behind the TOSLINK switcher.
If you would use AES then even around 100m or even more would be possible.

This way, you can make your Laptop or Desktop computer to a music player.

The best thing for me is, that I can remote control the MusicBee Player on Windows remote through Wireless using an Android app. Then I can play for example an Auto-Playlist (all at minimum 5-Star rated FLAC files) and skip or go back using the smartphone as remote.

But if you do not want/need a recording interface at all or to use your computer for music, then simply skip my idea, then KaiS solution is the most cost efficient for you and doesn't change anything in your setup. Then you also no not have to deal with TotalMix FX and routing ...

And older status, meanwhile a lot of devices changed, but this was the initial setup as described above:
https://www.tonstudio-forum.de/blog/Ent … her-EN-DE/

Some other views on it:

The actual setup how all fits into each other in Recording and HiFi Corner.
Do not look too much into the details, just to give you an impression, how nicely everything works together.

zyberguran, thank you for your input.

ramses, thank you for your thorough and fascinating explanation of an (it can be said) computer-based alternative using active interfaces. Unfortunately, that is well beyond my scope. As you suggest the cabling issue itself is a non-starter given the spouse's approval factor. The listening room is in fact the main living room, with painfully implemented equipment and furniture location and with aesthetics and sound quality in precarious balance (LOL): no computers allowed (relegated to the lower floor in a three-storied townhouse). So, I will be experimenting with KaiS's suggestion.

All the best.....dr.larkos