RCA versus XLR interconnects

I promised to report back, and here's the reply from Eversolo:

Question:

I have an Eversolo DMP-A6 DAC/Streamer.

It has XLR outputs, but I want to know whether the circuitry inside the unit is fully deferential?  In other words, two completely identical circuits out of phase to minimize distortion

Answer:

Regarding the issue, the answer is yes.

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Seems like this budget $850 DAC/Streamer has a full differential circuitry but Jay Iyagi (https://www.youtube.com/watch?v=ESZxMDxapm0) suggests it's Op-amp. One can only verify by opening the unit up which I'm not going to do so since it's under warranty. 

eylai777

Seems like this budget $850 DAC/Streamer has a full differential circuitry but Jay Iyagi ... suggests it’s Op-amp.

You don’t seem to understand balanced differential circuits, which commonly use operational amplifiers. It is not as simple as "two completely identical circuits out of phase to minimize distortion" as you seem to believe.

One can only verify by opening the unit up which I'm not going to do ...

The schematic would be just as helpful.

You’re probably right but I really don’t want to get too much into it either. 
 

If I have a decent system and tried my best to maximize it (without spending too much time), that’s good enough for me. Rest is for the forum community. Someone may find these posts helpful.