Balanced vs RCA between amp/preamp

I own balanced equipment, before I had SS unbalanced amps, on my rig and judging with my ears and a professional pianist ears as well I have replaced the balanced cables with mogami 2534 shielded, mogami 2549 unshielded, wireworld eclipse and in all three instances we weren't able to notice any difference in sound. Additionally to all these, replacing other components like dac, USB cables etc. Haven't made too much of a difference, as a matter of fact there have been a small difference in instrument presentation and Soundstage when changing things at the source but almost not noticeable not like others report on similar rigs with unbalanced connextions. Some people have recommended not using balanced shielded cables as they state sounds worse, I don't doubt it I just can't tell the difference on my rig.

My point is I truly suspect by empirical experience that balanced well designed equipment could be impervious, or maybe I should say apparently more resistant to changes on interconnects. 

Just my thoughts, 

Oh one more thing, there is unbalanced only equipment that price wise I seen it to be more expensive that their balanced counterpart, it might not be a general rule but it happens so cost IME is not so much of an issue. 

So back at wec56, yes using balanced vs unbalance there could be a difference IMO. You should experience more of a difference using different equipment manufacturers than cables anyways. 

Enjoy your system 

Reading the initial post again I missed something, the input source is single ended, this is a question for the others answering in this thread as I'm not sure of the answer. When the source is single ended shouldn't be the output single ended as well even when using the XLR output?