I'll bite.
Reiterating Ralph Karsten's (atmasphere) opinions, your equipment should follow AES standards for Balanced operation (that you are using Luxman equipment, I 'think' you should be in the clear, but having no wiring diagrams, I couldn't say for sure.
That being said,
I bought a set of Mogami XLR cables from Ralph, when I bought his amps and preamps (tubes). I followed my favorite dealers recommendation and tried some AQ XLR cables (non DBS). To my ears, it, too, didn't yield a significant difference.
I will say,
I have used AQ cables for my system after I heard the William Tell speaker cables. They were truly mindblowing in the sound difference from my GO-4's. So, I think that if I were to move up the line to a 'higher' cable, I might be able to hear a difference in XLR cables.
Is that worth the cost?
I love my system as it is, and am in no hurry to spend more.
HTH
Bob