No, I have never tried calculating impedances. Not even sure how to do that. I remember a cable tv installer told me that a coaxial splitter causes a 6db loss to the signal when inserted. I was thinking that something like that is going on here, but I'm not using a splitter anywhere, unless the 2 pairs of balanced outputs are internally split. A few minutes ago I disconnected my Audio GD headphone amp from my Denafrips DAC. I had it connected using the unbalanced RCA interface. The same type of problem was happening there. The sound immediately got more resolving simply by disconnecting the RCA cable. Denafrips says not to use the unbalanced RCA when using balanced XLR -- not sure why however. I know that all my source components are fully differential, including both amps.
As for the ISOMAX, I tried it in hopes of getting a line signal from the amp's output. The thinking here was that it would be separated from the amp's input signal. It didn't work either. So, I disconnected the balanced input from the Jeff Rowland amp feeding the ISOMAX and the same thing happened, the sound transparency and reverb immediately improved. The analog cabling is all Acoustic Zen Silver Ref II with Matrix Ref II on the sub. This is where I'm at.
https://www.google.com/search?q=jensen+transformers+sp-2sx&oq=jensen+&aqs=chrome.0.69i59j69i...
As for the ISOMAX, I tried it in hopes of getting a line signal from the amp's output. The thinking here was that it would be separated from the amp's input signal. It didn't work either. So, I disconnected the balanced input from the Jeff Rowland amp feeding the ISOMAX and the same thing happened, the sound transparency and reverb immediately improved. The analog cabling is all Acoustic Zen Silver Ref II with Matrix Ref II on the sub. This is where I'm at.
https://www.google.com/search?q=jensen+transformers+sp-2sx&oq=jensen+&aqs=chrome.0.69i59j69i...